The Zagreb Indoors (currently sponsored by PBZ) was a men's tennis event on the ATP Tour held in the Croatian capital of Zagreb, other than in 1998 when it was held in Split.

[2] From 2009 until 2015, it was a part of the ATP 250 Series and offered 250 ranking points.

The tournament was played on a fast and hard indoor surface (RuKort) and featured both men's singles and men's doubles tournament.

The Zagreb Indoors was held for the first time in nine years in 2006.

Due to financial difficulties the tournament was not held in 2016 and was replaced on the ATP calendar by the Sofia Open.