Baynes is a surname. Notable people with the surname include:
Adam Baynes, English politician
Aron Baynes (born 1986), New Zealand-born Australian basketball player
Helton Godwin Baynes, (1882–1943), analytical psychologist, author, translator of Carl Jung James Baynes (1766–1837), English painter Norman Hepburn Baynes (1877–1961), British historian of the Byzantine Empire Pauline Baynes (born 1922), English illustrator Robert Lambert Baynes (1796–1869), British naval officer Simon Baynes, British politician Stephen Baynes (born 1956), Australian dancer Sydney Baynes (1879–1938), British conductor and composer Thomas Mann Baynes (1794–1876), English artist, son of James Baynes Thomas Spencer Baynes (1823–1887), English philosopher
Fictional characters: Inspector Baynes, from the Sherlock Holmes story The Adventure of Wisteria Lodge