This list of most-disliked YouTube videos contains the top 50 videos with the most dislikes of all time, as derived from YouTube charts. YouTube implemented a like and dislike button on video pages in 2010 as part of a major site redesign. This feature serves as a replacement for the previous five-star rating system which was found to be ineffective because of the rare selection of ratings between two and four stars. Of the 50 videos in this list, 7 also appear in the list of most-viewed YouTube videos and 4 appear in the list of most-liked YouTube videos. The table does not indicate the actual popularity of videos, as some on the list may be extremely popular. For instance Despacito, Shape of You and Gangnam Style all appear on this list, but appear in the list of most-liked YouTube videos as well. As of September 2019, Cocomelon-Nursery Rhymes has the most videos in the top 50 with five, while Justin Bieber, Miley Cyrus, RiceGum, and YouTube Spotlight have two.
On December 13, 2018, YouTube Rewind 2018: Everyone Controls Rewind became the most disliked video on the video sharing platform, with 15 million dislikes rapidly surpassed the music video for Justin Bieber's song Baby, which entered the Guinness World Records book as the most disliked video on YouTube and on the Internet. As of December 31, 2018, YouTube Rewind 2018 has 5 million more dislikes than Justin Bieber's Baby.
In March 2011, Baby, which then had 1.17 million dislikes, was surpassed by the video for Rebecca Black's Friday, yielding more than 1.2 million dislikes. Friday amassed more than three million dislikes before the video was taken down in June 2011. The video was reinstated three months later and has not been taken down since.
Measurement of dislikes on YouTube has been of academic and political interest. Following its immediate negative reception, Rick Perry's 2012 presidential campaign advertisement Strong garnered over 600,000 dislikes within five days. This phenomenon was seen by Mike Barthel of The Village Voice as a reason not to judge entertainment and politics by the same standard of online publicity; he opined that the only time people are going to care more about politics than entertainment is when there is a clear and immediate threat to their well being.
While music videos make up a majority of the most disliked uploads to YouTube, the trailer for the 2016 film Ghostbusters became the most disliked movie trailer on the site, with over one million dislikes. Some commentators saw this backlash as a concerted effort to vote the film down into obscurity. Along with the most disliked movie trailer, 2016 showed the most disliked video game trailer, Call of Duty: Infinite Warfare, which stands at over three million dislikes. It became YouTube's second most disliked video within two weeks of being released. PewDiePie achieved a video in the top 5 by specifically asking his own viewers to dislike his video.