FK Mladost (Serbian Cyrillic: ФК Mлaдocт Гaцкo) is a football club from the town of Gacko, in Republika Srpska, Bosnia and Herzegovina.

The club played in the Premier League of Bosnia and Herzegovina in the 2002-03 season.

However, due to poor results FK Mladost was relegated to the First League of the Republika Srpska.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

The following former Mladost Gacko players have senior national team appearances: This article about a Bosnia and Herzegovina football club is a stub.