Mutt may refer to:

Animals:

• Mixed-breed dog, a dog that has characteristics of two or more breeds.

People:

• A colloquial term for people of very divergent ancestry. Can be pejorative, neutral, or positive, depending on the context.
• Nickname for Rodney Mullen, worldfamous skateboarder
• Robert John "Mutt" Lange, a successful music producer.

In music:

• MUTT (album), an album by Roots music group, Lost Dogs
• "Mutt" (song), a song from blink-182's 1999 album Enema of the State

In comics:

• Mutt, a character in the Mutt and Jeff comic strip
• Mutts, a daily comic strip by Patrick McDonnell

Mutt may also refer to:

• M151 MUTT, (Military Utility Tactical Truck), a US military jeep / light truck
• MUTT (MUD client), Multi-User Trivial Terminal - a gaming interface for Windows
• Mutt, a character from the G.I. Joe universe, usually accompanied by a dog named Junkyard.
• Mutt (e-mail client), a terminal-based e-mail client for Unix-like systems
• Mutt (hinduism) (also spelled as Math and correctly as maṭha), a type of Hindu monastery
• Mutt Williams, a character from Indiana Jones and the Kingdom of the Crystal Skull, played by Shia LaBeouf.