Summanen is a Finnish surname. Notable people with the surname include:
Eveliina Summanen, Finnish footballer Petteri Summanen, Finnish actor Raimo Summanen, Finnish ice hockey player Seth Everman (born Set Erik Adrian Summanen), Swedish musician and YouTuber, of some Finnish descent Teemu Summanen, Finnish Nordic combined skier
See also Lake Summanen or Summasjärvi, impact crater lake in Saarijärvi, Finland