Robert Ryan (1909–1973) was an American actor.
Robert Ryan may also refer to:
- Robert Ryan (Canadian politician) (1878–1954), Liberal Member of the Canadian House of Commons
- Robert Ryan (Irish politician) (1882–1952), Irish Fianna Fáil politician
- Robert Ryan (writer) (born c. 1963), English author, journalist and screenwriter
- Rob Ryan (born 1962), American football coach
- Rob Ryan (artist) (born 1962), British visual artist
- Rob Ryan (baseball) (born 1973), former baseball outfielder
- Rob Ryan (entrepreneur) (born 1948), founder of Ascend Communications and Entrepreneur America
- B. J. Ryan (Robert Victor Ryan Jr., born 1975), American baseball coach and pitcher
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