Atagün Yalçınkaya (born December 14, 1986) is a Turkish boxer in the bantamweight (54 kg) division best known for winning the silver medal in the light-flyweight category at the 2004 Olympics.

Yalçınkaya started boxing from a young age and won six titles in the schoolboy and cadet categories in Turkey.

He competed at light-flyweight in Athens, Greece and won a silver medal for Turkey on August 29, 2004, by beating Italy's Alfonso Pinto and reigning world champion Sergey Kazakov of Russia.

He went up to flyweight (51 kg) afterwards and won the Mediterranean Games in Almeria, Spain at the 2005 world championships (Mianyang, China) he defeated Andrzej Rzany (Poland) 20-13 but lost to Georgy Balakshin (Russia) 15-36.

In 2008 he signed a contract with German-based Ahmed Öner and turned pro in March 2008.