K-19: The Widowmaker is a 2002 historical submarine film directed and produced by Kathryn Bigelow, and produced by Edward S. Feldman, Sigurjon Sighvatsson, Christine Whitaker and Matthias Deyle with screenplay by Christopher Kyle. An international co-production of the United States, United Kingdom, Germany and Canada, the film takes place in 1961 and focuses its story on the Soviet Hotel-class submarine K-19.

The film stars Harrison Ford and Liam Neeson alongside Peter Sarsgaard, Donald Sumpter, Christian Camargo, Michael Gladis and John Shrapnel in supporting roles.

K-19: The Widowmaker was released by Paramount Pictures on July 19, 2002 in the United States while on September 5, 2002 in Germany and October 25, 2002 in the United Kingdom. The film received mixed reviews upon release, with critics praising the performances and dramatic atmosphere but criticizing the screenplay. The film was also a box-office bomb, grossing only $65.7 million worldwide on a budget of $90 million.