Baars is a Dutch language patronymic or toponymic surname. Notable people with the surname include:
de:Ab Baars (born 1955), Dutch jazz saxophonist and clarinettist
Bernard Baars (born 1946), Dutch-born American neuroscientist
Conrad Baars (1919–1981), Dutch psychiatrist
Hans Baars-Lindner (1925–2014), German competitive sailor
Henk Baars (born 1960), Dutch cyclist
Herman Baars (1822–1896), Norwegian governmental official
Jan Baars (1903–1989), Dutch fascist politician and World War II resistance member