Robert Lacey is a British historian.
Robert Lacey may also refer to:
- Robert C. Lacey, American businessman and politician from New York
- Bert Lacey (Robert Herbert Lacey, 1900–1984), Australian politician
- Bob Lacey (born 1953), baseball pitcher
- Bob Lacey (American football), American football wide receiver
- Bob Lacey of The Bob and Sheri Show
- Rob Lacey (1962–2006), British actor and author