Professor Ibrahim Haruna Lipumba (born 6 June 1952 in Ilolangulu, Tanganyika Territory) is a Tanzanian economist and politician.

He has held a number of positions in the field of education, as a university professor both in the United States and at home; and as a freelance economist.

Professor Lipumba has held the position of Chairman of Tanzania's main opposition party, the Civic United Front from 1995 to present day.

Running again as the CUF presidential candidate in the 2005 elections, Lipumba finished a distant second to Jakaya Kikwete of the ruling Chama Cha Mapinduzi (CCM) party winning 11.68% of the vote.

Professor Lipumba is a skilled orator drawing large crowds for his rallies; he is also an intellectual at heart and continues his career as a freelance economist albeit on a smaller scale due to political commitments.