Bailhache, from Norman French baille hache meaning to "give axe", perhaps used as an occupational surname for an executioner or a woodman, is a surname known from Jersey, England, and elsewhere. Notable people with this surname include:
- Alain Bailhache (born 1937), French painter
- Clement Bailhache (1856–1924), English lawyer and judge
- Jean Bailhache (1911–?), French author and translator
- John Bailhache (1787–1857), 10th mayor of Columbus, Ohio
- Sir Philip Bailhache (born 1946), Jersey politician and lawyer, Bailiff of Jersey (1994-2009)
- Robin Bailhache (born 1937), a former Australian Test cricket match umpire
- Sir William Bailhache (born 1953), Jersey lawyer, incumbent Bailiff of Jersey since 2015, brother of Philip Bailhache
- Hanks, P.; Coates, R.; McClure, P. (2016). The Oxford Dictionary of Family Names in Britain and Ireland. OUP Oxford. p. 18. ISBN 978-0-19-252747-9. Retrieved 16 September 2018.
- Browne, W.A.F.; Reaney, P.H.; Wilson, R.M.; Scull, A. (1991). A Dictionary of English Surnames. Tavistock classics in the history of psychiatry. Routledge. p. 158. ISBN 978-0-415-05737-0. Retrieved 16 September 2018.