Goodbye Mr. Loser (Chinese: 夏洛特烦恼; pinyin: Xià Luò Tè Fánnǎo) is a 2015 Chinese comedy film directed by Yan Fei and Peng Damo, and starring Shen Teng, Ma Li, Yin Zheng, Ai Lun, Wang Zhi, Tian Yu, Song Yang, Chang Yuan and Li Ping. The film is based on a play of the same name. It was released on September 30, 2015. Starring a cast of largely non-film comedians, the film became an enormous sleeper hit in China and was fueled by explosive word of mouth.

The film contains many references to Chinese popular culture in the late 1990s and early 2000s, including cameo appearances and depictions of well-known pop stars of that era. Some celebrities appear as themselves (including Jay Chou as a talent show contestant on The Voice, who performed a song Xia Luo had allegedly written, in reality one that Xia Luo had plagiarized from him), whilst others are depicted through stand-ins (for instance, Miss Na, who talent-spots Xia Luo in the new 1997 timeline).