FSV Union Fürstenwalde is a German football club from Fürstenwalde/Spree, currently playing in the NOFV-Oberliga Nord (V).

As with many East German clubs at the time, the club has a complicated history of formations, re-formations, ownership changes, legal changes, name-changes and mergers; however the lineage can be traced back as far back as 1919, with the current incarnation formed in 2002.

Dynamo, affiliated to sports association SV Dynamo and associated with the Stasi, the secret police of East Germany, experienced some success at the second level of GDR football, the DDR-Liga.

In 2002 Union merged with Wacker Fürstenwalde to form the current club.

A championship at this level in 2011 took the club up to the NOFV-Oberliga Nord where it played until 2016, when another title there brought Union up to the Regionalliga Nordost for the first time.