Robert Sullivan may refer to:
- Robert Sullivan (judoka) (born 1949), British Olympic judoka
- Robert Sullivan (poet) (born 1967), Māori writer from New Zealand
- Robert Sullivan (reporter), associated with The New Yorker
- Robert Austin Sullivan (1947–1983), American man executed in Florida
- Robert Baldwin Sullivan (1802–1853), Canadian lawyer, judge, and the second Mayor of Toronto
- Robert J. Sullivan Jr. (born 1945), American politician
- Robert Joseph Sullivan, American football player
- Robert Joseph Sullivan (educator) (1800–1868), Northern Irish educationalist, founder of Sullivan Upper School, author of English texts and dictionaries.
- Robbie Sullivan, fictional character in the television series Modern Family
- Bobby Sullivan, musician and activist
- Robert Michael Sullivan, paleontologist, Senior Curator of Paleontology and Geology at the State Museum of Pennsylvania