Soininen is a Finnish surname. Notable people with the surname include:

  • Heidi Soininen (born 1978), maiden name of Heidi Schauman, Finnish economist
  • Heikki Soininen (1891–1957), Finnish farmer and politician
  • Jani Soininen (born 1972), Finnish ski jumper
  • Jaron Soininen, drummer of the South Australian band Universum
  • Lauri Soininen (1875–1919), Finnish poet and journalist
  • Michael Soininen, guitarist and vocalist of the South Australian band Universum
  • Mikael Soininen (1860–1924), Finnish educationist and politician