Kasler is a surname of Germanic origins. Today, the Kasler name is most commonly found in Hungary, Northern Italy and Romania.
Notable people with the surname include:
Miklós Kásler (1950–2025), Hungarian oncologist, professor, director of the National Institute of Oncology, Minister of Human Resources of Hungary Horst Käsler (1926–1987), German handball player James H. Kasler (1926–2014), American military personnel