O - o
| O.K. ! | haya ! |
| oath | kiapo |
| obey | -tii |
| object | kitu |
| obligation | sharti |
| obstinacy | buri |
| obstruct | -zuia |
| obtain | -pata |
| obtain for | -patia |
| occasion | mara |
| occiput | kogo |
| · | kisogo |
| occupation | shughuli |
| ocean | bahari |
| o'clock | saa |
| October | Oktoba |
| of | -a |
| office | afisi |
| officer | afisa |
| official | rasmi |
| offspring | mwana |
| often | mara nyingi |
| ogre | zimwi |
| oil | mafuta |
| oil-palm | mchikichi |
| ok | vizuri |
| · | vema |
| old | -zee |
| · | -a zamani |
| old age | uzee |
| old person | mkongwe |
| · | mzee |
| olden times | zamani |
| omen | ishara |
| on | juu ya |
| · | katika |
| on the other side | ng'ambo ya |
| on the right | -a kuume |
| on the righthand | -a kuume |
| on top | juu |
| on your bottom | kitako |
| once more | tena |
| one | -moja |
| · | mosi |
| one by one | moja moja |
| one hundred | mia moja |
| one time | mara moja |
| onerous | -zito |
| onion | kitunguu |
| only | tu |
| open | -fumbua |
| · | -fungua |
| · | wazi |
| open smth wide | -tanua |
| opposed to | juu ya |
| opposite | kinyume |
| or | au |
| · | ama |
| · | wala |
| orange | chungwa |
| orange tree | mchungwa |
| order | amri |
| · | -amuru |
| · | -agiza |
| origin | asili |
| other | -ingine |
| our | -etu |
| ours | -etu |
| out | nje |
| outrigger canoe | ngalawa |
| outside | nje |
| · | nje ya |
| over there | kule |
| overcome | -shinda |
| overflow | -furika |
| overseer | msimamizi |
| owl | bundi |
| owner | mwenyewe |