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 mathematicsGyörgy Aczél (1917–1991), Hungarian communist politicianJános Aczél (died 1523), Hungarian poetJános Aczél (mathematician) (born 1924), Hungarian-Canadian mathematicianJózsef Aczél (1900–1945), Hungarian footballerPeter Aczel, British mathematicianSteve Aczel (born 1954), Hungarian/Australian boxer of the 1980s, '90s and 2000sZoltán Aczél (born 1967), Hungarian footballer