Domaći
| operativno neovisno tijelo | operationally independent authority | |
| Operativno upravljanje poduzećem | Operational managing of enterprises | |
| operativno vođenje | operation control | |
| operator | operator | |
| operator | tracker | |
| operator | operetor | |
| operator | surgeon | |
| operator | oparator | |
| operator javnih telekomunikacija | public telecommunications operator | |
| operator koji posjeduje pokretnu mrežu | mobile operator | |
| operator međugradskih veza | interexchange carrier | |
| operator međumjesnih veza | inter-exchange carrier | |
| operator mreže | network operator | |
| operator nabla | del | |
| operator računala | operator computer |
