Sir Seyyed Shahabedin Hosseini Tonekaboni (Persian: سر سید شهاب‌الدین حسینی تنکابنی; born February 3, 1974) is an Iranian actor, producer, director and screenwriter. He is known for his collaborations with Iranian Academy Award-winning director Asghar Farhadi in About Elly (2009), A Separation (2011), and The Salesman (2016). His accolades include a Cannes Film Festival Award for Best Actor, a Silver Bear for Best Actor, and a Crystal Simorgh for Best Actor.

Shahab Hosseini was born on February, 3rd, 1974 in Tehran. He earned his high school diploma in Biology. He dropped out of the University of Tehran as a psychology student and emigrated to Canada. Later, he became a radio host in Iran, and hosted a TV show for youth. He also took on some small acting roles in a few TV series. Hosseini's cinematic debut was in Rokhsareh (2002) directed by Amir Ghavidel. His career took off with his performance in the movie The Fifth Reaction directed by Tahmineh Milani.^[1] In June 2011, he announced that he would be taking a break but would return to cinema in 2013.^[2]