Aczél is a Hungarian surname meaning "steel". Notable people with the surname include:
Amir Aczel (1950–2015), Israeli-born American mathematics writer of Hungarian origin; author of books on mathematicians and the history of mathematics Gergely Aczél (born 1991), Hungarian chess player György Aczél (1917–1991), Hungarian communist politician János Aczél (royal secretary) (died 1523), Hungarian poet János Aczél (mathematician) (1924–2020), Hungarian-Canadian mathematician József Aczél (1900–1945), Hungarian footballer Peter Aczel (1941–2023), British mathematician Steve Aczel (born 1954), Hungarian/Australian boxer of the 1980s, '90s and 2000s Zoltán Aczél (born 1967), Hungarian footballer
See also Aczel's anti-foundation axiom