The famous actor who portrayed Jack Dawson in "Titanic" is Leonardo DiCaprio. In the iconic 1997 film directed by James Cameron, DiCaprio plays a young artist who falls in love with a wealthy passenger, Rose DeWitt Bukater, played by Kate Winslet. His performance as the charming and romantic Jack became a defining role and significantly boosted his career, making him a household name. The film itself was a monumental success, winning multiple Academy Awards and becoming one of the highest-grossing films of all time. DiCaprio's portrayal is remembered for its emotional depth and chemistry with Winslet.