Tan Sri Dato' Seri Haji Abu Hassan bin Omar (Jawi: أبو حسن بن عمر; 15 September 1940 – 8 September 2018) was a Malaysian 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 (1984–1986), Minister of Federal Territories (1986–1987), Minister of Foreign Affairs (1987–1992) and Minister of Domestic Trade and Consumer Affairs (1992–1997). He was also a former Member of Parliament for Kuala Selangor (1978–1997) and Selangor state assemblyman for Permatang (1997–2004) in Selangor.