Anonymous may refer to:

• Anonymous work, a work of art or literature that has an anonymous, undisclosed, or unknown creator or author
• Anonymous IV, a 13th century English student of medieval music theory whose works are a major source for modern scholars of that era
• List of anonymously published works
• Joe Klein, who used the pen name "Anonymous" while authoring Primary Colors

• Anonymous (group), the collective name of individuals that participate in certain online and real life activities, taken from the customary use of “anonymous” postings
• Anonymous for Animal Rights, an animal rights group based in Israel

• Anonymous (film), an upcoming film
• "Anonymous" (CSI), a first season episode of TV crime drama CSI: Crime Scene Investigation
• Anonymous (TV series), an Irish television show fronted by Jason Byrne

• Rodney Anonymous, the stage name of Rodney Linderman, a Philadelphia musician and humorist
• Jayson Sherlock, aka Anonymous, the single musician for the band Horde
• Anonymous (band), an Andorran band
• Anonymous (album), the third album by supergroup Tomahawk
• Anonymous (Tyske Ludder album), the fifth album by the German group Tyske Ludder
• "Anonymous" (Bobby Valentino song), a 2007 single by Bobby Valentino
• "Anonymous" (Sleater-Kinney song), a song by Sleater-Kinney
• "Anonymous" (Spacehog song), a song by Spacehog