Lady Vengeance (Korean: 친절한 금자씨; lit. Kind-hearted Geum-ja; titled Sympathy for Lady Vengeance in Australia and Russia) is a 2005 South Korean neo-noir psychological thriller film directed by Park Chan-wook. The film is the third and final installment in Park's Vengeance Trilogy, following Sympathy for Mr. Vengeance (2002) and Oldboy (2003). It stars Lee Young-ae as Lee Geum-ja, a woman released from prison after serving the sentence for a murder she did not commit. The film tells her story of revenge against the real murderer.

The film debuted on 29 July 2005 in South Korea, and competed for the Golden Lion at the 62nd Venice International Film Festival in September 2005. While it failed to win in competition, it did walk away with Cinema of The Future, the Young Lion Award, and the Best Innovated Film Award in the non-competition section. It won the award for Best Film at the 26th Blue Dragon Film Awards. The film had its US premiere on 30 September 2005 at the New York Film Festival. It began its limited release in North American theatres on 5 May 2006, to favorable reviews from critics.