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The 2009–10 A-1 League (Croatian: A-1 liga 2009./10.) was the 19th season of the A-1 League, the highest professional basketball league in Croatia.
The first half of the season consisted of 10 teams and 90-game regular season (9 games for each of the 10 teams) began on Saturday, October 17, 2009 and ended on Sunday, March 14, 2010. The second half of the season consists of 4 teams from ABA League and the best 4 teams from first half of the season.
Teams in italics had home advantage. Teams in bold won the playoff series. Numbers to the left of each team indicate the team's original playoff seeding. Numbers to the right indicate the score of each playoff game.