Pir Mazhar Ul Haq is parliamentary leader of Pakistan Peoples Party in Sindh Assembly and Senior Provincial Minister in the Sindh Provincial Government, holding the portfolio of Education. He was elected from PS-74 Dadu-IV in Dadu, Sindh, Pakistan. He is a grandson of former chief minister Pir Ilahi Bux, who served the province from May 1948 to 1949. He is also the grandson of Qazi Akbar, who was a provincial minister in Sindh, including serving as Home Minister.
Pir Mazhar is the great nephew of Qazi Abdul Majeed Abid, who held numerous Federal Ministries in President Muhammad Zia-ul-Haq government, including Federal Minister of Food and Agriculture, Federal Minister for Information and Broadcasting, and Federal Minister for Water and Power. He is also the nephew of Dr. Fahmida Mirza, the present Speaker of the National Assembly of Pakistan and nephew of ex-MNA Qazi Asad Abid.