Nasimuddin Siddiqui (born 4 June 1959) is an Uttar Pradesh politician and a member of Samajwadi Party, formerly a prominent member of Bahujan Samaj Party. He was expelled by BSP chief Mayawati on 10 May 2017. He became an MLA in Uttar Pradesh Legislative Assembly in 1991. Later he was made a cabinet minister in Mayawati government. He joined Indian National Congress on 22 February at the Congress office, in New Delhi with more than 35,000 of his supporters and several MPs and MLAs of Uttar Pradesh.