PTU, also known as PTU: Police Tactical Unit, is a 2003 Hong Kong neo-noir action thriller film produced and directed by Johnnie To, starring Simon Yam, Maggie Shiu, Lam Suet and Ruby Wong.

Simon Yam Tat-wah is a Hong Kong actor and film producer. He received international acclaim for his performances in international film festival and box office hits such as Naked Killer, SPL: Sha Po Lang, Election, Election 2, Exiled, Lara Croft: Tomb Raider – The Cradle of Life and The Thieves.