The 2006–07 Croatian First Football League (officially known as Prva HNL Ožujsko for sponsorship reasons) was the sixteenth season of the Croatian First Football League, the national championship for men's association football teams in Croatia, since its establishment in 1992.
Dinamo Zagreb were the defending champions, having won their eleventh championship title the previous season, and they defended the title again, after a win against Međimurje on Matchday 29, played on 28 April 2007.
During the first two rounds, each team played each other once home and away for a total of 22 matches.
The pairings of the third round were then set according to the standings after the first two rounds, giving every team a third game against each opponent for a total of 33 games per team.
Zadar win 6–2 on aggregate and are promoted to 2007–08 Prva HNL.