- Osmia
- Osmia adae
- Osmia aeruginosa
- Osmia agilis
- Osmia aglaia
- Osmia alaiensis
- Osmia albiventris -- Leucosmia albiventris (Cresson, 1864)
- Osmia albolateralis -- Osmia dubia_homonym Cresson, 1864, Osmia visenda Sandhouse, 1924, Osmia albolateralis visenda Sandhouse, 1924
- Osmia alfkenii -- Osmia crinita Alfken, 1942
- Osmia aliciae
- Osmia alpestris
- Osmia alticola
- Osmia amathusica
- Osmia anceps -- Osmia (Hemiosmia) pulchra Tkalců, 1975
- Osmia anceyi -- Hoplosmia (Odontanthocopa) biarmica van der Zanden, 1994
- Osmia andrenoides
- Osmia angustipes
- Osmia apicata -- Osmia macroglossa Gerstäcker, 1869
- Osmia aquila
- Osmia argyropyga -- Osmia entoprocta Pérez, 1879
- Osmia ariadne
- Osmia ashmeadii -- Acanthosmioides ashmeadii Titus, 1904
- Osmia atriventris
- Osmia atroalba
- Osmia atrocyanea -- Osmia senior Cockerell, 1907, Osmia pseudamala Cockerell, 1910, Osmia putata Cockerell, 1910, Osmia (Melanosmia) atrocyanea putata Cockerell, 1910
- Osmia aurulenta -- Apis aurulenta Panzer, 1799
- Osmia austromaritima
- Osmia avedata
- Osmia avosetta
- Osmia azteca -- Osmia erythrotricha Cockerell, 1912, Osmia mea Strand, 1921, Osmia costaricensis Friese, 1925
- Osmia bakeri
- Osmia balearica
- Osmia bella
- Osmia bicolor -- Apis bicolor Schrank, 1781, Apis rustica Geoffroy, 1785, Apis fusca_homonym Christ, 1791, Apir hirundinaria Christ, 1791, Osmia pyrenaea Lepeletier, 1841, Osmia fusca_homonym Gistel, 1857, Osmia rufitarsis Smith, 1879, Osmia monachiensis Strand, 1917
- Osmia bidentata -- Osmia bidentata Morawitz, 1876, Osmia affinis Frivaldszky, 1876, Anthocopa (Odontanthocopa) bidentata pallens Tkalců, 1979, Hoplosmia (Odontanthocopa) bidentata pallens (Tkalců, 1979)
- Osmia bischoffi
- Osmia botitena -- Osmia conjuncta marilaunidii Cockerell, 1914
- Osmia breviata
- Osmia brevicornis -- Eucera brevicornis Fabricius, 1798, Osmia atrocaerulea Schilling, 1849, Osmia panzeri Morawitz, 1869, Osmia leucogastra Morawitz, 1875, Osmia atrocaerulea cyanella_homonym Alfken, 1931, Osmia atrocaerulea subcyanea Alfken, 1935, Osmia (Metallinella) brevicornis leucogastra Morawitz, 1875, Osmia (Metallinella) brevicornis subcyanea Alfken, 1935
- Osmia brevipes
- Osmia brevis -- Osmia wilmattae Cockerell, 1906, Osmia Osmia wheeleri Cockerell, 1906, Osmia peridonea Sandhouse, 1924, Osmia brevis peridonea Sandhouse, 1924
- Osmia bruneri -- Osmia bennettae Cockerell, 1907, Osmia holochlora Cockerell, 1923
- Osmia bucephala -- Osmia megacephala Cresson, 1864, Osmia latitarsis Cresson, 1864, Osmia lignivora Packard, 1867, Osmia lignicola Provancher, 1882, Osmia subornata Cockerell, 1897, Centrosmia bucephala (Cresson, 1864)
- Osmia caerulescens -- Apis caerulescens Linnaeus, 1758, Apis aenea Linnaeus, 1761, Apis muraria_homonym Retzius, 1783, Apis cuprea Geoffroy, 1785, Andrena cupraria Walckenaer, 1802, Osmia rustica Cresson, 1864, Osmia purpurea_homonym Cresson, 1864, Osmia coerulescens (Linnaeus, 1758), Osmia dutti Cockerell, 1922, Andrena cyanea Fabricius, 1793, Megachile cyanea Walkenaer, 1802, Anthophora cyanea Fabricius, 1804, Osmia caerulescens cyanea (Fabricius, 1793), Osmia coerulescens cyanea (Fabricius, 1793)
- Osmia cahuilla
- Osmia calcarata
- Osmia californica -- Osmia pascoensis Cockerell, 1897, Osmia nassa Cockerell, 1910, Osmia occidentalis Michener, 1936
- Osmia calla
- Osmia cara -- Osmia (Nothosmia) bridwelli Sandhouse, 1939, male only
- Osmia carinoclypearis
- Osmia caulicola
- Osmia cephalotes -- Osmia longiceps Morawitz, 1876, Osmia bacillus Pérez, 1879, Osmia pulsata Buysson, 1900, Osmia (Pyrosomia) cephalotes longiceps Morawitz, 1876
- Osmia cerasi
- Osmia cerinthidis -- Osmia (Osmia) cerinthidis crassiclypeata Peters, 1978
- Osmia chalybea -- Chalcosmia chalybea (Smith, 1853)
- Osmia chinensis
- Osmia chrysaetos
- Osmia chrysolepta
- Osmia cinctella -- Osmia tarfensis Saunders, 1908
- Osmia cinerea
- Osmia cinnabarina
- Osmia claremontensis
- Osmia clarescens
- Osmia clypearis -- Osmia macedonica Tkalců, 1979, Osmia (Helicosmia) clypearis acuta Warncke, 1988
- Osmia cobaltina -- Osmia basilissa Cockerell, 1911, Osmia kerminesina Sandhouse, 1924
- Osmia cockerelli
- Osmia collinsiae
- Osmia coloradensis -- Osmia hypochrysea Cockerell, 1906, Osmia hypochrysea Rohweri Cockerell, 1907, Osmia pasadenae Cockerell, 1910
- Osmia concavoclypearis
- Osmia conjuncta -- Osmia quadridentata_homonym Cresson, 1878, Osmia cressoni Dalla Torre, 1896, Diceratosmia conjuncta (Cresson, 1864)
- Osmia cordata -- Osmia hesperella Cockerell, 1906, Osmia coloradella Cockerell, 1906, Osmia ramaleyi Cockerell, 1907, Osmia figginsi Cockerell, 1935
- Osmia corniculata -- Hoplitis (Nasutosmia) corniculata van der Zanden, 1989
- Osmia cornifrons -- Chalicodoma cornifrons Radoszkowski, 1887
- Osmia cornuta -- Megachile cornuta Latreille, 1805, Osmia divergens Friese, 1920, Osmia neoregaena Mavromoustakis, 1938, Osmia (Osmia) cornuta divergens Friese, 1920, Osmia (Osmia) cornuta neoregaena Mavromoustakis, 1938, Osmia (Osmia) cornuta quasirufa Peters, 1978
- Osmia crassa
- Osmia crinita
- Osmia croatica -- Osmia croatica Friese, 1893, Hoplosmia (Hoplosmia) croatica (Friese, 1893)
- Osmia croceiventris
- Osmia cyanella -- Osmia aprilina Cockerell, 1907, Osmia aprilina atrovirens Sandhouse, 1924, Osmia brevior Michener, 1936
- Osmia cyaneonitens
- Osmia cyanescens
- Osmia cyanopoda -- Osmia parallela Michener, 1936
- Osmia cyanoxantha -- Osmia cyanoxura van der Zanden, 1991, Osmia (Pyrosmia) elbalba Warncke, 1992
- Osmia cyrenaica
- Osmia dakotensis -- Osmia (Acanthosmioides) dacotensis Sandhouse, 1939, emend
- Osmia damascena
- Osmia decorata
- Osmia densa -- Osmia olivacea Cockerell, 1907, Osmia proposita Sandhouse, 1924, Osmia pogonigera Cockerell, 1910, Osmia celsa Sandhouse, 1924, Osmia densa pogonigera Cockerell, 1910
- Osmia derasa -- Osmia crosi Benoist, 1929, Osmia pseudoderasa Benoist, 1950, Osmia (Pyrosmia) derasa violetta Warncke, 1992
- Osmia dido -- Osmia dido Gribodo, 1894, Osmia abbreviata_homonym Pérez, 1896, Osmia compacta Pérez, 1896
- Osmia difficilis -- Osmia falcata Morawitz, 1875, Osmia alborufa Alfken, 1935
- Osmia dilaticornis
- Osmia dimidiata -- Osmia dimidiata rossica Friese, 1899, Pseudosmia taurica Radoszkowski, 1874, female only, Osmia taurica_homonym Radoszkowski, 1887, Osmia (Helicosmia) dimidiata assomatosana Le Goff, 2005
- Osmia diomedia
- Osmia disjuncta
- Osmia distincta
- Osmia distinguenda -- Anthocopa (Odontanthocopa) distinguenda Tkalců, 1974
- Osmia dlabolae
- Osmia dolerosa
- Osmia dusmeti
- Osmia ednae
- Osmia elegans -- Hoplosmia (Hoplosmia) elegans Tkalců, 1992
- Osmia emarginata -- Osmia emarginata fusca_homonym Benoist, 1928, Osmia emarginata infuscata Peters, 1978
- Osmia enixa
- Osmia ephippiata
- Osmia erythrogastra
- Osmia excavata -- Osmia mitsukurii Cockerell, 1911, Osmia (Pachyosmia) heudei Cockerell, 1931
- Osmia exigua -- Osmia exiguua Cresson, 1887, Osmia vana Sandhouse, 1924
- Osmia fallax -- Osmia fallax Pérez, 1895
- Osmia fasciata -- Osmia sita Nurse, 1904, Osmia kuznetzovi Cockerell, 1930, Osmia bucharica Popov, 1935
- Osmia fedtschenkoi -- Osmia (Ceratosmia) balucha Nurse, 1904, Osmia usbekistana Cockerell, 1930
- Osmia felti
- Osmia ferruginea -- Osmia metallica Lucas, 1849, Osmia igneopurpurea Costa, 1882, Osmia (Pyrosmia) ferruginea igneopurpurea Costa, 1882
- Osmia forticornis
- Osmia foxi
- Osmia francisconis
- Osmia frieseana
- Osmia frunseensis
- Osmia frustrata
| - Osmia gabrielis
- Osmia gallarum -- Osmia ruborum Dufour and Perris, 1921, Osmia lapidistructor Ferton, 1921, Osmia gallarum lapidistructor Ferton, 1921
- Osmia gaudiosa
- Osmia gemmea -- Osmia purpurea_homonym Pérez, 1896, Osmia ligulicornis Friese, 1899
- Osmia georgica -- Osmia (Gnathosmia) louisianae Cockerell, 1901, Gnathosmia georgica (Cresson, 1878)
- Osmia giffardi
- Osmia giliarum
- Osmia glareola
- Osmia glauca -- Heriades glaucum Fowler, 1899, Osmia exilis Sandhouse, 1924
- Osmia gracilicornis
- Osmia granulosa
- Osmia grindeliae
- Osmia grinnelli
- Osmia gulmargensis
- Osmia gutturalis
- Osmia haemorrhoa
- Osmia heliaca
- Osmia hellados -- Osmia gallarum hellados van der Zanden, 1984
- Osmia hemera
- Osmia hendersoni
- Osmia hermona
- Osmia hermonensis -- Hoplosmia (Odontanthocopa) hermonensis Tkalců, 1992
- Osmia hesperos
- Osmia heteracantha -- Osmia aredeola Warncke, 1988, Osmia ardeola Warncke, 1988
- Osmia hurdi
- Osmia hyperborea
- Osmia iberica -- Osmia (Exosmia) difficilis clanga Warncke, 1988
- Osmia illinoensis
- Osmia imitatrix
- Osmia indeprensa
- Osmia indigotea
- Osmia inermis -- Anthophora (Osmia) inermis Zetterstedt, 1838, Osmia globosa_homonym Cresson, 1864, Osmia vulpecula Gerstäcker, 1869, Osmia globosiformis Cockerell, 1910, Osmia bulgarica Friese, 1922, Osmia (Melanosmia) inermis bulgarica Friese, 1922
- Osmia inspergens
- Osmia integra -- Osmia novomexicana Cockerell, 1903, Osmia florissanticola Cockerell, 1906, Osmia integra nigrigena Michener, 1936
- Osmia inurbana -- Osmia eutrichosa Cockerell, 1910
- Osmia iridis
- Osmia ishikawai
- Osmia ivaefolia
- Osmia jacoti -- Osmia (Chalcosmia) imaii Hirashima, 1973
- Osmia jason
- Osmia jilinensis
- Osmia juxta -- Osmia theta Sandhouse, 1925, Osmia subpurpurea jamesi Michener, 1937, Osmia subpurpurea Cockerell, 1897, Osmia juxta subpurpurea Cockerell, 1897
- Osmia kashmirensis
- Osmia kenoyeri
- Osmia kincaidii
- Osmia kirgisiana
- Osmia kohli
- Osmia labialis -- Osmia (Helicosmia) labialis tornensis Tkalců, 1975
- Osmia lacus
- Osmia laeta
- Osmia lanei
- Osmia larochei -- Osmia (Odontanthocopa) larochei Tkalců, 1993
- Osmia laticauda -- Osmia tichodroma Warncke, 1992
- Osmia laticella -- Osmia laticeps_homonym Friese, 1899
- Osmia latisulcata
- Osmia latreillei -- Megachile latreillii Spinola, 1806, Megachile latreillei Spinola, 1806, emend, Osmia nasidens Latreille, 1811, Osmia quadricornis Kriechbaumer, 1869, Osmia friesei Verhoeff, 1892, Osmia latreillei iberoafricana Peters, 1975
- Osmia lazulina
- Osmia leaiana -- Apis hirta_homonym Geoffroy, 1785, Apis leaiana Kirby, 1802, Osmia atra Schenck, 1853, Osmia confusa Morawitz, 1869, Osmia solskyi Morawitz, 1870, Osmia truncatula Thomson, 1872, Osmia bidens Pérez, 1879, Osmia forsii Alfken, 1924, Osmia (Helicosmia) ventralis schachti Warncke, 1988
- Osmia lhotelleriei
- Osmia lignaria -- Osmia purpurascens, Smith, 1849, Osmia propinqua Cresson, 1864, Osmia lignaria lignariella Cockerell, 1906, Osmia lignaria propinqua Cresson, 1864, Ceratosmia lignaria (Say, 1837)
- Osmia ligurica -- Osmia ligurica Morawitz, 1868, Osmia detrita Pérez, 1879
- Osmia liogastra
- Osmia livida
- Osmia lobata -- Osmia leucopyga Ducke, 1899
- Osmia longicornis
- Osmia longula -- Osmia abnormis Cresson, 1878, Osmia grandior Cockerell, 1897, Osmia permorata Cockerell, 1910
- Osmia lunata
- Osmia lupinicola
- Osmia madeirensis
- Osmia malina
- Osmia maracandica -- Osmia robusta_homonym Morawitz, 1875
- Osmia marginata
- Osmia marginipennis -- Osmia gaillardiae Cockerell, 1906, Osmia viridior Cockerell, 1907, Osmia leonis Cockerell, 1907
- Osmia maritima
- Osmia maxillaris -- Osmia (Orientosmia) maxillaris dinazade Peters, 1978, Osmia (Orientosmia) maxillaris scheherazade Peters, 1978
- Osmia mediana
- Osmia melanocephala
- Osmia melanogaster -- Osmia aterrima Morawitz, 1872, Osmia carniolica Morawitz, 1872, Osmia incerta Radoszkowski, 1876, Osmia subaenea Pérez, 1895, Osmia (Helicosmia) melanogaster subaenea Pérez, 1895, Osmia (Helicosmia) melanogaster carniolica Morawitz, 1872
- Osmia melanopleura
- Osmia melanota
- Osmia melanura
- Osmia mertensiae
- Osmia michiganensis
- Osmia microdonta
- Osmia milenae
- Osmia mirhiji -- Osmia mirhyi Mavromoustakis, 1957
- Osmia mixta
- Osmia mongolica -- Osmia jacoti var lilacina Cockerell, 1930
- Osmia montana -- Osmia armaticeps Cresson, 1878, Osmia armaticeps var saponellis Cockerell, 1901, Osmia quadriceps Cresson, 1878, Osmia montana quadriceps Cresson, 1878
- Osmia moreensis
- Osmia morongana
- Osmia mustelina -- Osmia emarginata var griseohirta Alfken, 1935, Osmia mustelina umbrosa Peters, 1978, Osmia (Osmia) mustelina griseohirta Alfken, 1935
- Osmia mutensis
- Osmia nana -- Osmia tetradonta Benoist, 1934
- Osmia nanula -- Osmia phaceliae Cockerell, 1907
- Osmia nasoproducta -- Osmia proboscidea Benoist, 1950
- Osmia nasuta -- Osmia rhynchaena Pérez, 1905, Hoplitis (Nasutosmia) nasuta (Friese, 1899)
- Osmia nemoris -- Osmia seclusa Sandhouse, 1924, Osmia abdominalis Michener, 1935
- Osmia neocyanopoda
- Osmia nifoata -- Osmia pellax Sandhouse, 1924, Osmia (Acanthosmioides) wyomingensis Michener, 1936
- Osmia nigricollis
- Osmia nigrifrons -- Osmia casta Cockerell, 1910
- Osmia nigritula
- Osmia nigriventris -- Anthophora nigriventris Zetterstedt, 1838, Osmia frigida Smith, 1853, Osmia hudsonica Cresson, 1864, Osmia baicalensis Radoszkowski, 1867, Osmia corticalis Gerstäcker, 1869
- Osmia nigrobarbata -- Osmia vanduzeei Sandhouse, 1924
- Osmia nigrohirta -- Osmia bicolor nigrohirta Friese, 1899
- Osmia nigroscopula -- Chelostoma nigroscopula Wu, 1982
- Osmia niveata -- Apis fulviventris_homonym Panzer, 1798, Anthophora niveata Fabricius, 1804, Osmia minuta Bramson, 1879, Osmia sieversi Morawitz, 1886, Osmia carneiventris Radoszkowski, 1887, Osmia fulviventris var albiscopa_homonym Alfken, 1914
- Osmia niveibarbis -- Osmia tarfensis Saunders, 1908
- Osmia niveocincta -- Osmia violascens Pérez, 1895
- Osmia notata -- Osmia decemsignata Radoszkowski, 1874, Osmia (Chalcosmia) laterefasciata Costa, 1884
- Osmia novaescotiae
- Osmia nuda
- Osmia obliqua
- Osmia ocularis
- Osmia odontogaster
- Osmia odorata
- Osmia olgae -- Anthocopa (Odontanthocopa) olgae Tkalců, 1978
- Osmia onocrotala -- Osmia (Helicosmia) onocrotola_sic Warncke, 1988
| - Osmia opima
- Osmia oramara
- Osmia orientalis
- Osmia padri -- Anthocopa (Odontanthocopa) padri Tkalců, 1974
- Osmia pagosa
- Osmia palmae
- Osmia palmyrae
- Osmia pamirensis -- Osmia rickmersi Alfken, 1931
- Osmia paradisica
- Osmia parietina -- Osmia angustula Zetterstedt, 1838, Osmia vankovitzii Radoszkowski, 1887
- Osmia pedicornis
- Osmia pennata
- Osmia pentstemonis
- Osmia peregrina
- Osmia phenax
- Osmia physariae -- Osmia pinorum Cockerell, 19354, Osmia Osmia (Acanthosmioides) erecta Michener, 1936, Osmia crenulaticornis Michener, 1936
- Osmia picena -- Hoplosmia (Hoplosmia) picena Tkalců, 1999
- Osmia pieli
- Osmia pikei -- Osmia integrella Cockerell, 1907, Osmia vallicola Cockerell, 1907, Osmia amala Cockerell, 1907, Osmia metitia Cockerell, 1909
- Osmia pilicornis
- Osmia pingreeana
- Osmia pinguis -- Osmia pinguis Pérez, 1895, Osmia indivisa Benoist, 1928, Hoplosmia (Paranthocopa) pinguis carbo van der Zanden, 1994
- Osmia polkruga
- Osmia potentillae
- Osmia pratincola
- Osmia proxima -- Osmia sericea Cresson, 1864, Osmia melanotricha Lovell and Cockerell, 1907
- Osmia prunorum
- Osmia pulsatillae
- Osmia pumila -- Osmia vicina Cresson, 1864
- Osmia punica -- Osmia punica irherma Tkalců, 1992
- Osmia purpurata
- Osmia pusilla
- Osmia quadricornuta
- Osmia ramona
- Osmia raritatis
- Osmia rawlinsi
- Osmia recta
- Osmia regulina
- Osmia relicta -- Anthocopa (Erythrosmia) relicta Popov, 1954
- Osmia rhodoensis -- Osmia (Tergosmia) rhodoensis arquata Warncke, 1988, Osmia (Tergosmia) rhodoensis ferina Warncke, 1988
- Osmia ribifloris -- Osmia ribifloris biedermannii Michener, 1936
- Osmia rostrata
- Osmia rufa -- Apis bicornis Linnaeus, 1758, Apis rufa Linnaeus, 1758, Apis globosa Scopoli, 1763, Apis agino Harris, 1776, Apis cornigera Rossi, 1790, Apis fronticornis Panzer, 1799, Osmia hedera Smith, 1844, Osmia fracticornis Pérez, 1895, Osmia rufa var borealis Ducke, 1899, Osmia rufa cornigera (Rossi, 1790), Osmia rufa fracticornis Pérez, 1895
- Osmia rufigastra
- Osmia rufina
- Osmia rufinoides
- Osmia rufohirta -- Osmia fulvohirta Lepeletier, 1841, Osmia spiniventris Giraud, 1857, Osmia rufohirta soror Pérez, 1896
- Osmia rufotibialis
- Osmia rutila -- Osmia xanthognatha Pérez, 1895
- Osmia sanctaerosae
- Osmia sandhouseae -- Osmia albohirta_homonym Mitchell, 1924
- Osmia sanrafaelae
- Osmia satoi
- Osmia saxatilis
- Osmia saxicola -- Osmia caelestina Benoist, 1934, Osmia cypricola Mavromoustakis, 1937, Osmia posti Mavromoustakis, 1956, Osmia (Pyrosmia) saxicola riemanni Warncke, 1992
- Osmia sculleni
- Osmia scutellaris -- Osmia scutellaris Morawitz, 1868
- Osmia scutispina
- Osmia sedula -- Osmia lutzi Michener, 1936
- Osmia sequoiae
- Osmia sexsignata
- Osmia shaanxiensis
- Osmia signata -- Osmia melanippa Spinola, 1808, Osmia jucunda Smith, 1853, Osmia vidua Gerstäcker, 1869, Osmia cincta Dours, 1873, Pseudosmia taurica Radoszkowski, 1874, male only, Osmia laticincta Pérez, 1879, Osmia atriventris_homonym Costa, 1883, Osmia costaniana Dalla Torre and Friese, 1895, Osmia (Helicosmia) signata laticincta Pérez, 1879
- Osmia simillima -- Osmia canadensis Cresson, 1864, Osmia cognata Cresson, 1864, Osmia major Robertson, 1902, female only, Osmia chlorops Cockerell and Titus, 1902, Osmia stasima Lovell, 1909
- Osmia simplex
- Osmia sladeni
- Osmia sogdiana -- Osmia prasina Morawitz, 1875, Osmia nassonow Pérez, 1902, Osmia heirosolomita Benoist, 1934, Osmia dives Mocsáry, 1877, Osmia medanae Magretti, 1890, Osmia subintegra Pérez, 1902, Osmia (Helicosmia) sogdiana dives Mocsáry, 1877
- Osmia solitaria
- Osmia sparsipuncta
- Osmia spinigera -- Osmia spinigera Latreille, 1811, Osmia clavicula Gerstäcker, 1869, Hoplosmia (Hoplosmia) spinigera (Latreille, 1811)
- Osmia spinulosa -- Apis spinulosa Kirby, 1802, Osmia euchreiformis Radoszkowski, 1882, Hoplosmia (Hoplosmia) spinulosa (Kirby, 1802)
- Osmia sponsa
- Osmia stangei
- Osmia steinmanni
- Osmia subaustralis -- Osmia wardiana Cockerell, 1907, Osmia seneciophila Cockerell, 1907, Osmia nelsoni Cockerell, 1930, Osmia wardiana austromontana Michener, 1936, Osmia lyncis Cockerell, 1937, Osmia (Cephalosmia) mendocinensis Sandhouse, 1939
- Osmia subcornuta -- Osmia rubicola Friese, 1891
- Osmia subfasciata -- Osmia conjunctoides Robertson, 1893, Osmia punctata Michener, 1936, Diceratosmia subfasciata (Cresson, 1872), Osmia (Diceratosmia) subfasciata miamiensis Mitchell, 1962
- Osmia submicans -- Osmia giraudi Schmiedeknecht, 1886, Osmia submicans hebraea Benoist, 1934, Osmia submicans canaria Mavromoustakis, 1957, Osmia aurantiaca Stanek, 1969, Osmia (Pyrosmia) submicans canaria Mavromoustakis, 1957, Osmia (Pyrosmia) lanzarotae Tkalců, 1992, Osmia (Pyrosmia) submicans lanzarotae Tkalců, 1992, Osmia (Pyrosmia) submicans columbina van der Zanden, 1996
- Osmia subtersa
- Osmia svenssoni
- Osmia sybarita -- Osmia ruficollis Dours, 1873, Osmia fossoria Pérez, 1891, Osmia (Allosmia) sybarita fossoria Pérez, 1891
- Osmia tadjika
- Osmia tanneri
- Osmia tarsata
- Osmia taurus
- Osmia tawildara
- Osmia tergestensis -- Osmia ononidis Ferton, 1897, Osmia rondoui Pérez, 1902, Osmia wolhynica Noskiewicz, 1922, Osmia atlantica Benoist, 1934, Anthocopa tergestensis remota Tkalců, 1979, Osmia (Tergosmia) tergestensis ononidis Ferton, 1897
- Osmia tersula -- Osmia subarctica Cockerell, 1912
- Osmia teunisseni
- Osmia texana -- Osmia mandibularis Cresson, 1878, Osmia faceta Cresson, 1878, Osmia davidsoniella Cockerell, 1905
- Osmia thoracica -- Osmia pentheri Kohl, 1905
- Osmia thysanisca
- Osmia tingitana -- Osmia (Neosmia) tkalcui secunda Peters, 1977
- Osmia titusi
- Osmia tokopahensis
- Osmia torquata
- Osmia trevoris -- Osmia subtrevoris Cockerell, 1906, Osmia corkinsi Sandhouse, 1924
- Osmia tricornis
- Osmia trifoliama
- Osmia tristella -- Osmia hypoleuca Cockerell, 1897, Osmia cyanosoma Cockerell, 1916, Osmia tristella cyanosoma Cockerell, 1916
- Osmia tunensis -- Apis tunetana Gmelin, 1790, Osmia pseudoaurulenta Dours, 1873, Osmia aurulenta meridionalis Gribodo, 1894, Osmia dissimilis Friese, 1899
- Osmia tyrneri -- Hoplosmia (Hoplosmia) tyrneri (Tkalců, 1992)
- Osmia unca -- Osmia (Acanthosmioides) uncinata_homonym Michener, 1936, Osmia (Acanthosmioides) depressa Michener, 1937, Osmia (Acanthosmioides) hicksi Sandhouse, 1939
- Osmia uncicornis
- Osmia uncinata -- Osmia laticeps Thomson, 1872
- Osmia universitatis
- Osmia vandykei
- Osmia versicolor -- Osmia corrusca Erichson, 1835, Osmia versicolor corrusca Erichson, 1835, Megachile laeta Gistel, 1857, Megachile algarbiensis Strand, 1917, Osmia (Pryosmia) versicolor viricephalica Warncke, 1992
- Osmia virga
- Osmia viridana -- Osmia rufispina Morawitz, 1875, Osmia angulata Pérez, 1895, Osmia viridana rufispina Morawitz, 1875, Osmia viridana mulleolus van der Zanden, 1984, Osmia viridana nicosiana Mavromoustakis, 1939
- Osmia warnckei -- Hoplosmia (Odontanthocopa) warnckei Tkalců, 1992
- Osmia watsoni
- Osmia xanthomelana -- Apis xanthomelana Kirby, 1802, Osmia fuciformis Latreille, 1811, Osmia chrysomelina Panzer, 1812, Osmia (Melanosmia) xanthomelana clarior Tkalců, 1983
- Osmia yanbianensis
- Osmia zarzisa
- Osmia zephyros
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