Ahl is a surname. Notable people with the surname include:
David H. Ahl (born 1939), American writer Ernst Ahl (1898–1945), German zoologist Frederick Ahl (1941–2025), American academic and classical scholar John Alexander Ahl (1813–1882), American railroad executive and politician Kennet Ahl, pseudonym of Swedish crime novelist duo Lasse Strömstedt and Christer Dahl