Fien or Feen may refer to:

Fien

• Casey Fien (born 1983), American former Major League Baseball pitcher
• Cassie Fien (born 1985), Australian marathon runner
• 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