- OD
- odalisque
- odd
- odd fellow
- odd fish
- Odd Hassel
- odd man out
- odd-even check
- odd-job
- odd-job man
- odd-leg caliper
- odd-pinnate
- odd-pinnate leaf
- odd-toed ungulate
- oddball
- oddish
- oddity
- oddly
- oddment
- oddments
- oddness
- Oddone Colonna
- odds
- odds and ends
- odds-maker
- odds-on
- ode
- Oder
- Oder River
- Odesa
- Odessa
- Odets
- Odin
- odious
- odiously
- odiousness
- odist
- odium
- Odo
- Odo of Lagery
- Odoacer
- Odobenidae
- Odobenus
- Odobenus divergens
- Odobenus rosmarus
- Odocoileus
- Odocoileus hemionus
- Odocoileus hemionus columbianus
- Odocoileus Virginianus
- odometer
- Odonata
- odonate
- odontalgia
- Odontaspididae
- Odontaspis
- Odontaspis taurus
- odontiasis
- Odontoceti
- odontoglossum
- odontoid process
- odontology
- Odontophorus
- odor
- odoriferous
- odorize
- odorless
- odorous
- odour
- odourise
- odourless
- Odovacar
- Odovakar
- odynophagia
- Odysseus
- odyssey