Nostalgia Critic is an American review comedy web series created, directed by and starring web comedian Doug Walker. The series initially launched on YouTube in July 3, 2007, before moving to Walker's own site, That Guy with the Glasses, then to Channel Awesome. The show follows Walker as the title character, a bitter and sarcastic critic who mostly reviews films and television shows from his childhood and recent past, usually with comically exaggerated rage. The show often alternates the Critic's angry rants and humor with legitimate analysis of the episode's subject.

Walker briefly retired the series in August 14, 2012, to work on other projects, even writing the character out of existence in the Channel Awesome film To Boldly Flee. On January 22, 2013, Walker announced the show's return in a narrative video called "The Review Must Go On".