Tan Sri Dato' Seri Haji Abu Hassan Omar (born 15 September 1940 in Bukit Belimbing, Kuala Selangor) is a Malaysian politician. He was the 12th Chief Minister of Selangor, Malaysia, governing from 1997-2000. He received his early education at the Malay School of Bukit Belimbing (1946–1950) before furthering his studies at Klang High School (1951–1957), Malay College Kuala Kangsar (1958–1959) and University of Hull, England (1960–1963 and 1971–1973).