The 2006 PBZ Zagreb Indoors was a men's tennis tournament held on indoor hard courts. It was the 3rd edition of the event (and the first since 1997, when the tournament was known as the Croatian Indoors). It was part of the ATP International Series of the 2006 ATP Tour. It took place at the Dom Sportova in Zagreb, Croatia from January 30 through February 6, 2006. Ivan Ljubičić won the singles title.
Ivan Ljubičić defeated Stefan Koubek 6–3, 6–4
- It was Ivan Ljubičić's 2nd title of the year and the 5th of his career.
Jaroslav Levinský / Michal Mertiňák defeated Davide Sanguinetti / Andreas Seppi 7–6(9–7), 6–1