crimes against humanity
See war crimes.

• offensive weapon
• offer
• offer of amends
• Office for the Supervision of Solicitors
• Office of Fair Trading
• Office of Public Sector Information
• official copy
• Official Custodian for Charities
• Official Journal
• official receiver
• official referee
• official search
• official secrets
• Official Solicitor
• OFT
• Ogden tables
• Old Bailey
• oligopoly
• Ombudsman
• omission
• omnia praesumuntur rite et solemniter esse acta
• on all fours with
• onomastic
• onus of proof
• onus probandi