Mary Poppins Returns is a 2018 American musical fantasy comedy film directed by Rob Marshall, with a screenplay written by David Magee and a story by Magee, Marshall, and John DeLuca. Loosely based on the book series Mary Poppins by P. L. Travers, the film is a sequel to the 1964 film Mary Poppins, and stars Emily Blunt as Mary Poppins, with supporting roles from Lin-Manuel Miranda, Ben Whishaw, Emily Mortimer, Julie Walters, Dick Van Dyke, Angela Lansbury, Colin Firth, Meryl Streep, and David Warner in his final film appearance. Set in London during the Great Depression, the film sees Mary Poppins, the former nanny of Jane and Michael Banks, return to them in the wake of the death of Michael's wife.

Walt Disney Pictures announced the film in September 2015. Marshall was hired later that month, and Blunt and Miranda were cast in February 2016. Principal photography lasted from February to July 2017, and took place at Shepperton Studios in England. Mary Poppins Returns had its world premiere at the Dolby Theatre in Hollywood on 29 November 2018, and was theatrically released in the United States on 19 December 2018, making it the longest interval between film sequels in cinematic history, at 54 years.

The film grossed $349 million worldwide and received positive reviews from critics, who praised the performances of the cast (particularly those of Blunt and Miranda), direction, visuals, musical score, musical numbers, costume design, production values, visual effects (especially the animated segments), and sense of nostalgia, although some critics found it too derivative of its predecessor. It was chosen by both the National Board of Review and American Film Institute as one of the top ten films of 2018 and received numerous award nominations, including four at the 76th Golden Globe Awards (including for Best Motion Picture – Musical or Comedy), nine at the 24th Critics' Choice Awards, three at the 72nd British Academy Film Awards, and a SAG Award nomination for Blunt at the 25th Screen Actors Guild Awards. It also received four Oscar nominations for Best Original Score, Best Original Song ("The Place Where Lost Things Go"), Best Production Design, and Best Costume Design at the 91st Academy Awards.