Orford
Gules, three keys enfiled with as many crowns Or.
Robert Orford, 1303

Osborne
Quarterly, ermine and azure, over all a cross Or.
Osborne, 1674

Oxford City
Argent, an ox gules, armed and unguled or, passing a ford of water in base proper.

Oxford University
Azure, on an open book proper, having the dexter side seven seals Or, between three ducal coronets of the last the words DOMINVS ILLVMINATIO MEA.