Ivan Ljubičić (March 19 1979) is a Croatian tennis player.

Ljubičić won his first singles title at Lyon in 2001.

In 2005, he has reached 4 finals so far: in Doha (Qatar), Marseille (France) and Rotterdam (Netherlands) and Dubai (UAE). He was defeated by Roger Federer in three of them. Ljubičić, however, stretched his last two encounters with the world's top player to the deciding third set, which exemplifies the nature of good form Ljubičić is experiencing currently.

In March 2005, Ljubičić hit top form in Croatia's first round Davis Cup encounter against the United States. In his first singles match, he defeated Andre Agassi convincingly in straight sets. He then teamed with Mario Ančić to defeat Bryan brothers, world's second ranked doubles team. He finally clinched victory for his country, defeating America's number one player and former world number one Andy Roddick in five sets.