SEMTA or Semta may refer to:
Organizations Southeastern Michigan Transportation Authority, later renamed Suburban Mobility Authority for Regional Transportation SEMTA Commuter Rail, a former commuter rail line in Detroit, Michigan Sector Skills Council for Science, Engineering and Manufacturing Technologies Serviço Especial de Mobilização de Trabalhadores para a Amazônia
Places Semta (Africa), a former Ancient city and bishopric in Africa Pronconsularis, now a Latin Catholic titular see