Stranger Things is an American science fiction drama television series created by the Duffer Brothers, who also serve as showrunners. Its first season was released on Netflix on July 15, 2016, with the fifth and final season renewed in February 2022. Set in the 1980s, primarily in the fictional town of Hawkins, Indiana, the series centers on a number of mysteries and supernatural events occurring around the town and their impact on an ensemble of child and adult characters. It stars Winona Ryder, David Harbour, Finn Wolfhard, Millie Bobby Brown, Gaten Matarazzo, Caleb McLaughlin, Natalia Dyer, Charlie Heaton, Noah Schnapp, Sadie Sink, Joe Keery, Cara Buono, Matthew Modine, Dacre Montgomery, Sean Astin, Paul Reiser, Maya Hawke, Priah Ferguson, and Brett Gelman.

The Duffer Brothers developed Stranger Things as a mix of investigative drama and supernatural elements portrayed with horror and childlike sensibilities, while infusing references to the pop culture of the 1980s. Several thematic and directorial elements were inspired by the works of Steven Spielberg, John Carpenter, David Lynch, Stephen King, Wes Craven and H. P. Lovecraft. They also took inspiration from experiments conducted during the Cold War and conspiracy theories involving secret government experiments.

One of Netflix's flagship series, Stranger Things has attracted record viewership on the streaming platform. The series has been critically acclaimed for its characterization, atmosphere, acting, soundtrack, directing, writing, and homages to 1980s films. It has received numerous awards and nominations, including nominations from the Golden Globe Awards, British Academy Television Awards, Directors Guild of America Awards, Writers Guild of America Awards, and Grammy Awards, as well as wins from the Primetime Emmy Awards, Screen Actors Guild Awards, American Film Institute, Critics' Choice Television Awards, and People's Choice Awards.