Ahmet Haldun Dormen (born 5 April 1928) is a Turkish theater, movie and TV series actor and film director. Dormen is of Turkish Cypriot descent.

His father Sait Ömer Bey was a Cypriot businessman, while his mother Nimet Rüştü Hanım was the daughter of a pasha from Istanbul. His family settled in Şişli before Dormen's first birthday. He had his first acting experience on stage as a junior high school student at the Galatasaray High School, portraying a character in a play titled Demirbank. He finished his education at the Robert College. At the age of eight, his left foot was injured due to an accident.

For his theater education, he went to the USA and studied at Yale University. He graduated with a master's degree. For two years, he worked as an actor and director in various theaters in the United States. He performed in 4 plays in Pasadena Playhouse in Hollywood. When he returned to Istanbul, he entered the Küçük Sahne stage under the direction of Muhsin Ertuğrul and had his first role in front of the Turkish audience with the play Cinayet Var.