null - oner
- obliteration
- oblivion
- obloquy
- obreptio
- obreption
- obrogare
- obrogation
- obscene
- obscene advertising
- obscene exhibition
- obscene language
- obscene matter
- obscene picture
- obscene publication
- obscene show
- obscenity
- observe
- obsession
- obsignare
- obsolescence
- obsolete
- obsolete law
- Obsta principiis
- obstante
- obstetrician
- obstetrics
- obstinate desertion
- obstriction
- obstruct
- obstructing easement
- obstructing enlistments
- obstructing highway
- obstructing justice
- obstructing mails
- obstructing navigation
- obstructing officer
- obstruction
- obstruxit
- Obstupare
- Obstupavit et obstruxit