Harrison "Harry" Siejka (/siːkə/) (born 3 February 1992) is an Australian rugby league footballer who plays for the Canterbury-Bankstown Bulldogs. He has also played for a National Rugby League club, the St George Illawarra Dragons, and the Wakefield Trinity Wildcats and the Bradford Bulls in the Super League. He plays as a five-eighth but he can also play as a halfback. Siejka is a Polish dual-code rugby representative, having played for both the rugby league team and rugby union team.