| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| ODY | OULEDYOUSSEF[1281]; | TR.DR | SUN | |
| OFN | OROFEN[145][1281]; | TR.AE | CHL | |
| OG | OLAETA-GORRION[1281]; | TR.AE | S | ARG |
| OGG | OLAETA-GRAL.GUEMES[1281] | TR.AE | S | ARG |
| OGM | OLAETA-GENERAL-MITRE[145][1281] | TR.AE | S | ARG |
| OH | OLAETA-HORNERO[145][1281]; | TR.AE | S | ARG |
| OHL | OLAETA-HALCON[145][1281]; | TR.AE | S | ARG |
| OHR | OHRIDANKA[1281]; | TR.AE | W | YUG |
| OI | OITEST[145][1281]; | TR.AE | S | BRA |
| OLB | OLAETA-LIBERTAD[145][1281]; | TR.AE | S | ARG |
| OLDS | OLDSQUAN[115][1281]; | TR.DR | S | MEX |
| ON | OLESEN[144];OLESONS-DWARF[1281]; | TR.AE | ZIM | |
| ONC | ONCATIVO-INTA[145][1765] | TR.AE | S | ARG |
| ONDA | ONDA-INIA[145][144][1281]; | TR.AE | S | CHL |
| OPLK | OPLENKA[1281]; | TR.AE | W | YUG |
| OPR | OSPREY[176]; | TR.AE | W | AUS |
| ORI | ORIOLE[114][144][1281]; | TR.AE | S | MEX |
| ORSK | ORASANKA[1281]; | TR.AE | W | YUG |
| ORU | OLAETA-RUMBO[145][1765]; | TR.AE | S | ARG |
| ORVC | OROVCANKA[1281]; | TR.AE | W | YUG |