Haldun Alagaş (born 16 November 1970) is a Turkish karateka competing in the kumite -70 kg division.
Following his graduation from the high school, In 1989, Alagaş enrolled in the Middle East Technical University in Ankara to study physical education.
[2] With gaining success in sports at international level, karate became a lifelong passion and a life style for him.
[2] Alagaş competed between 1994 and 2005 for Istanbul Büyükşehir Belediyespor's newly formed karate team.
In 2006, Alagaş transferred to Kocaeli Büyükşehir Belediyesi Kağıt Spor Kulübü in his hometown, where he was until 2010.