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Tan Sri Dato' Seri Dr. Haji Abu Hassan bin Omar (born 15 September 1940) is aMalaysian politician from United Malays National Organisation (UMNO), a major component party of Barisan Nasional (BN) coalition.^[1] He was the 12th Menteri Besar (Chief Minister) of Selangor, Malaysia,^[2] from 1997 to 2000. Previously he was also the Minister of Social Welfare (1985–1986), Minister of Federal Territories (1986–1987), Ministry of Foreign Affairs (1987–1991) and Minister of Domestic Trade and Consumer Affairs (1991–1997). He was also a formerMember of Parliament for Kuala Selangor (1978–1997) and Selangor state assemblyman for Permatang (1997–1999) in Selangor.