Attila László Hadnagy (born 8 September 1980) is a Romanian former footballer who played as a forward and serves as the general director of Liga I club Sepsi OSK.
Hadnagy started his career at hometown club Oltul Sfântu Gheorghe.
In the summer of 2007, he joined the more ambitious Liga II side FC Brașov managed by Răzvan Lucescu and captained by Róbert Ilyés.
In the summer of 2016 he joined Sepsi OSK, his hometown's recently founded team.
With his 28 goals in 31 games he played a vital role in obtaining promotion to Liga I at the end of the 2016–17 season.