Believe It or Not may refer to:

• Believe It or Not (album), a 1979 album by Nutshell
• Believe It or Not (song), the theme song of the television series The Greatest American Hero
• Ripley's Believe It or Not!, an American franchise which deals in bizarre events and items
• The Riddle of Master Lu, a 1995 point-and-click adventure game released for MS-DOS
• Ripley's Believe It or Not! (TV series), various American documentary television series
• Ripley's Believe It or Not! (Philippine TV series), a 2008 Philippine version of the television series

• Muar River (Mozambique)
• Muar (Town)
• Muar (town)
• Muary
• Muasdale
• Muaskar Anole
• Mu'askar Anole
• Mu'askar Ras Kamboni
• Muata Jamvo
• Muaupoko
• Muawija
• Mu'awiyah Ibn Abi Sufyaan
• Muawiyah ibn Abu Sufyan
• Mu'awiya I
• Mu'awiya ibn Hisham
• Mu'awiya II
• Muawiyyah
• Mu'awwidhatayn
• Muay
• Muayad Khalid
• Muayan Halaili
• Muay at the 2007 Southeast Asian Games
• Muay at the 2009 Southeast Asian Games
• Muay Lao
• Muaythai