Loki is an American television series created by Michael Waldron for the streaming service Disney+, based on Marvel Comics featuring the character of the same name. It is the third television series in the Marvel Cinematic Universe (MCU) produced by Marvel Studios, sharing continuity with the films of the franchise. The series takes place after the events of the film Avengers: Endgame (2019), in which an alternate version of Loki created a new timeline. Waldron served as head writer and Kate Herron directed the first season, with Eric Martin and the duo Justin Benson and Aaron Moorhead serving as head writer and leading the directing team for the second season, respectively.

Tom Hiddleston reprises his role as Loki from the film series, starring alongside Gugu Mbatha-Raw, Wunmi Mosaku, Eugene Cordero, Tara Strong, Owen Wilson, Sophia Di Martino, Jonathan Majors, and Neil Ellice. Sasha Lane, Jack Veal, DeObia Oparei, and Richard E. Grant also star in the first season, with Rafael Casal, Kate Dickie, Liz Carr, Ke Huy Quan and Richard Dixon joining for the second. By September 2018, Marvel Studios was developing a number of limited series for Disney+, centered on supporting characters from the MCU films. A series featuring Hiddleston as Loki was confirmed in November 2018. Waldron was hired in February 2019, and Herron joined by that August. Martin, who served as a writer on the first season, was revealed to be writing the entire second season in February 2022, along with Benson and Moorhead joining to direct the majority of the season's episodes; Dan DeLeeuw and Kasra Farahani also direct in the second season. Filming occurred in Atlanta, Georgia for the first season, with the second season being filmed in the United Kingdom.

Loki premiered on June 9, 2021. Its first season, consisting of six episodes, concluded on July 14 and is part of Phase Four of the MCU. It received positive reviews from critics, especially for the performances. A second season, also consisting of six episodes, ran from October 5 to November 9, 2023, as part of Phase Five. It also received positive reviews, with praise for its conclusion, musical score, and Loki's character arc.