Mahy may refer to:
Barry Mahy (1942–2020), football player Margaret Mahy (1936–2012), New Zealand children's author Nathalie Mahy (1995 – c. 2006), child murdered along with her step sister by Abdallah Ait-Oud Nicolás Mahy (1757–1822), Spanish military commander Thomas de Mahy, marquis de Favras (1744–1790), French aristocrat Thomas Henry Mahy (1862–1936), newspaper columnist