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Contagion is a 2011 American thriller film directed by Steven Soderbergh. Its ensemble cast includes Marion Cotillard, Matt Damon, Laurence Fishburne, Jude Law, Gwyneth Paltrow, Kate Winslet, Bryan Cranston, Jennifer Ehle, and Sanaa Lathan. The plot concerns the spread of a virus transmitted by respiratory droplets and fomites, attempts by medical researchers and public health officials to identify and contain the disease, the loss of social order in a pandemic, and the introduction of a vaccine to halt its spread. To follow several interacting plot lines, the film makes use of the multi-narrative "hyperlink cinema" style, popularized in several of Soderbergh's films.

Following their collaboration on The Informant! (2009), Soderbergh and screenwriter Scott Z. Burns discussed a film depicting the rapid spread of a virus, inspired by pandemics such as the 2002–2004 SARS outbreak and the 2009 flu pandemic. Burns consulted with representatives of the World Health Organization as well as medical experts such as W. Ian Lipkin and Lawrence "Larry" Brilliant. Principal photography started in Hong Kong in September 2010, and continued in Chicago, Atlanta, London, Geneva, and San Francisco until February 2011.

Contagion premiered at the 68th Venice International Film Festival in Venice, Italy on September 3, 2011, and was theatrically released on September 9, 2011. Commercially, the film made $136.5 million against its $60 million production budget. It was praised by critics for its narrative and the performances. It was also well received by scientists, who lauded its accuracy. The film has received renewed popularity during the 2019–20 coronavirus pandemic.