Lego City Undercover is a 2013 action-adventure game developed by TT Fusion and published by Nintendo for the Wii U. It was re-released for the Nintendo Switch, PlayStation 4, Windows, and Xbox One by Warner Bros. Interactive Entertainment in 2017. Based on the City-themed toyline by Lego, the narrative follows police officer Chase McCain as he returns to Lego City and pursues escaped crime boss Rex Fury. Gameplay features McCain both exploring the open world hub of Lego City, and completing self-contained levels featuring puzzles and combat.

After satisfactory technical advancements and the completion of other Lego video games featuring existing IPs, the first prototypes for Lego City Undercover were produced in 2010, with development beginning in 2011 after Nintendo approached parent company TT Games about developing for the Wii U. At the time production began, it was to be the first Lego video game featuring voice acting, and it was the first in the TT Games Lego series not to rely on a movie or comic license. The script, written by Graham Goring, made extensive use of parody and references to various media. The Lego City hub was based on multiple real locations. Nintendo was generally hands-off with the development process but would receive updates and suggest changes.

The game was originally announced at E3 2011 as Lego City Stories for Wii U and Nintendo 3DS. Additional info was shown at E3 2012, where the game was also officially renamed to Lego City Undercover. The 3DS version became a standalone prequel, titled Lego City Undercover: The Chase Begins. Lego City Undercover was released in most regions in March 2013, with Japan following in July. The remastered version, which included local two-player multiplayer, was announced in 2016 and released in April 2017. The game received generally positive reviews from critics, who praised the story, humour, and evolved gameplay formula, but criticized the lack of co-op options and varying technical issues, such as long loading times. The original Wii U version sold over 1.15 million copies worldwide as of 31 December 2022.