- Ob [LBO:0000858] —
- Oberhasli [LBO:0001008] —
- Ogye [LBO:0001121] — Extremely rare, dual-purpose breed that originated in South Korea.
- Oh-Shamo [LBO:0000699] —
- Old English Game [LBO:0000322] —
- Old Norwegian [LBO:0000568] —
- Oldenburg [LBO:0000859] —
- Ongole [LBO:0000199] —
- Orkney [LBO:0000569] —
- Orlov Trotter [LBO:0000860] —
- Orma Boran [LBO:0000200] —
- Oropa [LBO:0000201] —
- Orpington [LBO:0000323] —
- Ossabaw Island [LBO:0000392] —
- Ossimi [LBO:0000570] —
- Ouessant [LBO:0001133] — Short-tailed, small-statured sheep originating from the island of Ouessant, off the coast of France.
- Ovambo [LBO:0000202] —
- Oxford [LBO:0000571] —
- Oxford Sandy and Black [LBO:0000393] —
Data returned: 19
terms all with first letter "O".
Data updated: Oct 09, 2025
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