Mahlangu is a surname. Notable people with the surname include:
Bongani Mahlangu (born 1979), boxer from South AfricaChris Mahlangu or Eugène Terre'Blanche (1941–2010), South African politician and founder and leader of the Afrikaner Weerstandsbeweging (AWB)Duncan Mahlangu (born 1983), South African taekwondo practitioner who competed in the men's featherweight categoryEsther Mahlangu (born 1935), South African Ndebele artistJabu Mahlangu (formerly Jabu Jeremiah Pule) (born 1980), retired South African football (soccer) midfielderJuly Mahlangu (born 1980), South African football (soccer) midfielder for Thanda Royal ZuluM. J. Mahlangu, South African politicianMagodonga Mahlangu, women's rights campaigner from Zimbabwe who in 2009 was awarded the Robert F Kennedy Human Rights Award by U.S. President Barack ObamaMay Mahlangu (born 1989), South African footballerMoses Mahlangu (born 1925), long-time supporter of the teachings of The Church of Jesus Christ of Latter-day Saints (LDS Church) in South AfricaSibusiso Mahlangu (born 1982), South African football (soccer) playerSolomon Mahlangu (1956–1979), South African operative of the African National Congress (ANC) militant wing, Umkhonto weSizwe (MK), hanged for murder in 1979Thamsanqa Mahlangu (died 2015), former MDC politician and Zimbabwe Deputy Minister of Youth Development, Indigenisation and EmpowermentGwen Mahlangu-Nkabinde (born 1955), South African politician who was Speaker of the National Assembly of South Africa from 2008 to 2009