Moondog was an American composer and musician, born as Louis T. Hardin.

Moondog may also refer to:

• Moondog, nickname of disc jockey Alan Freed
  • Moondog Coronation Ball, a 1952 event in Cleveland hosted by Freed, generally regarded as the first major Rock and Roll concert
• The Moondogs, a 1970s punk rock band from Northern Ireland
• Moondog (band), a late-1980s hardcore band featuring members of Gorilla Biscuits
• Moondog Jr., a Belgian musical band later known as Zita Swoon
• Moondog (1956 album), an album by Moondog
• Moondog (1969 album), an album by Moondog
• Moondog Matinee, a 1973 covers album by The Band in tribute to Alan Freed's The Moondog Radio Show

• Moondog Rex (1950–2019), an American professional wrestler
• Moondog (comics), a comic by George Metzger
• Moondog, a character in the comic strip Monty
• Moondog (sculpture), created by Tony Smith
• Moon dog, a bright spot on a lunar halo
• Moondog, mascot of the Cleveland Cavaliers NBA basketball team
• The Moondogs (professional wrestling), a professional wrestling stable
• Moondog Mayne, a common ring name of professional wrestler Ronald Doyle Mayne
• Moon Dogs, science fiction short stories by Michael Swanwick
• Moondog, the main character in the Harmony Korine movie The Beach Bum
• Moondog Brewery, craft brewery based in Melbourne Australia that occasionally collaborates with Mountain Goat Beer

• Johnny and the Moondogs, an early name of The Beatles
• Moondoggie

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