Hong Si-hoo () is a South Korean professional footballer who plays as a midfielder for K League 1 side Gimcheon Sangmu, on loan from Incheon United, where he hold his army-duty.
Hong made his professional debut for K League 1 side Seongnam on 9 May 2020 against Gwangju. He came on as a 76th minute substitute for Choe Byeong-chan as Seongnam won 2âÂÂ0.