2012–13 1. FC Union Berlin season

The 2012–13 1. FC Union Berlin season is the 107th season in the club's football history. In 2012–13 the club plays in the 2. Fußball-Bundesliga, the second tier of German football. It is the clubs fourth consecutive season in this league, having played at this level since 2009–10, after it was promoted from the 3. Liga in 2009.

The club also takes part in the 2012–13 edition of the DFB-Pokal, the German Cup, where it reached the second round and will face third division side Kickers Offenbach next.