Fien or Feen may refer to:
Fien Casey Fien (born 1983), American former Major League Baseball pitcher Cassie Fien (born 1985), Australian marathon runner Gavin Fien (born 2007), American baseball player Nathan Fien (born 1979), New Zealand former international rugby league footballer Fien Delbaere (born 1996), Belgian racing cyclist Fien van Eynde (born 1998), Belgian racing cyclist Fien Troch (born 1978), Belgian film director, producer and screenwriter
Feen Maas van der Feen (1888–1973), Dutch tennis player Paul van der Feen (born 1978), Dutch saxophonist