Phantom Thread is a 2017 American romantic period drama film written and directed by Paul Thomas Anderson. It stars Daniel Day-Lewis, Vicky Krieps, and Lesley Manville, and follows an haute couture dressmaker in 1950s London who takes a young waitress as his muse. It is Day-Lewis's most recent film to date. The film is the first Anderson film shot outside the United States, with principal photography beginning in January 2017 in Lythe, England. It is Anderson's second collaboration with Day-Lewis, after There Will Be Blood (2007), and his fourth collaboration with composer Jonny Greenwood.

Phantom Thread premiered in New York City on December 11, 2017, and was theatrically released in the U.S. two weeks later. It received acclaim for its acting, screenplay, direction, musical score, costume design, and production values. The National Board of Review chose it as one of the top ten films of 2017, and it is widely considered one of the best films of the 2010s.

At the 90th Academy Awards, the film was nominated for Best Picture, Best Director for Anderson, Best Actor for Day-Lewis, Best Supporting Actress for Manville, and Best Original Score for Greenwood; it won for Best Costume Design. It also earned four nominations at the 71st British Academy Film Awards, winning for Best Costume Design, and received two Golden Globe nominations.