| Name | Accession number | Synonym | Species | Habit | Locality |
|---|---|---|---|---|---|
| ONAKAYAMA | K-62726 | OONAKAYAMA[2246]; OONOKAYAMA[541]; | TR.AE | W | JPN |
| ONAS | K-25530; PI-46796; CI-6221; AUS-740; KU-318 | TR.AE | S | AUS:South-Australia | |
| ONAS-41 | CI-12229; AUS-744 | TR.AE | S | USA:California | |
| ONAS-49 | TR.AE | S | USA | ||
| ONAS-52 | AUS-745 | N-7000315[2964]; | TR.AE | S | USA |
| ONAS-53 | K-43098; CI-13257; CI-13069; KU-341 | TR.AE | S | USA:California | |
| ONATE | TR.AE | ESP | |||
| ONAVAS-F-2009 | CGSS-01-B-00069-T[3836]; | TR.AE | S | MEX | |
| ONCATIVO-INTA | K-51110; PI-344467; AUS-21876 | ONCATIVO-INTA-1[3184]; | TR.AE | S | ARG |
| ONDA-INIA | K-62621; AUS-24428 | CM-8399-D-4M-3Y-1M-1Y-0M[144][145][1765]; QU-10.090[145]; PAVONQU-10.090[1765]; | TR.AE | S | CHL |
| ONDUR | TR.DR | W | ROM | ||
| ONEAL | PI-659480 | BZ-999-592[2965]; | TR.AE | S | USA:Montana |
| ONED-ZANSTI | TR.AE | S | ZWE | ||
| ONEGA | FINE-NORTH-RUSSIAN-WHEAT[5]; | TR.AE | S | RUS:Sankt-Peterburg | |
| ONIBOZU | TR.AE | W | JPN | ||
| ONIGERA | TR.AE | USA | |||
| ONIKS | TR.DR | W | RUS:Rostov | ||
| ONIX | DON-MARIO-ONIX[4205]; D.M.ONIX[000]; DM-ONIX[4338]; | TR.AE | S | BRA | |
| ONIX-5 | TR.AE | S | BRA | ||
| ONO | TR.DR | S | YUG |