Oxford dictionary may refer to any dictionary published by Oxford University Press, particularly:
Historical dictionaries
Oxford English Dictionary (OED)
Shorter Oxford English Dictionary, an abridgement of the OED
Single-volume dictionaries
Oxford Dictionary of English (ODE)
New Oxford American Dictionary (NOAD)
Concise Oxford English Dictionary (COD)
Compact Oxford English Dictionary of Current English
Oxford Advanced Learner's Dictionary (OALD)
Oxford Russian Dictionary (ORD)
Other works
Oxford Dictionaries (website)
Oxford Dictionary of National Biography (DNB)