Overheard (traditional Chinese: 竊聽風雲; simplified Chinese: 窃听风云; pinyin: Qie Ting Feng Yun; Cantonese Yale: Sit Teng Fung Wan) is a 2009 Hong Kong crime thriller film written and directed by Alan Mak and Felix Chong, and produced by Henry Fong and Derek Yee.

The film stars Lau Ching-wan, Louis Koo and Daniel Wu as a trio of police officers conducting surveillance on a public company.

At the Hong Kong Police Force Commercial Crime Bureau, an operation is underway to infiltrate a trading company, Feng Hua International where a man, nicknamed "Boss" is the chief suspect.

The team of Criminal Intelligence Bureau (CIB) officers, led by Inspector Leung (Lau Ching-wan) together with Yeung (Louis Koo) and Lam (Daniel Wu), installs interception devices to monitor the company's communications.

One night, while monitoring a conversation between the company's manager and his secretary, Yeung and Lam overhear that the stock price will surge on market opening the next day.

Because of Leung's compassion for his subordinates' mistakes and unwillingness to turn them in and seek help from the rest of the police force, he is unable to stop their unnecessary deaths.

While under police escort, the van carrying the Boss drives off course, and the driver is revealed to be Yeung, who was the sole survivor of the attempted murder of him and his family.

Yeung drives himself and the Boss off the unfinished bridge into the harbour as part of a murder-suicide, while Leung sadly looks on and remembers the happy times with his two subordinates.

Before filming began, Daniel Wu held a party at his home with the rest of the lead actors, so they could establish their on-screen chemistry beforehand.