Mud is a liquid or semi-liquid mixture of water and soil.

Mud or MUD may also refer to:

• Drilling fluid, commonly called drilling mud
• Joint compound, powdered gypsum mixed with water

• Mud (TV series), a BBC television program
• Mud (1997 film), a Bulgarian short film
• Mud (2012 film), a coming-of-age drama film directed by Jeff Nichols

• Mud (band), British glam rock band
• Mud (album), a 2016 album by Whiskey Myers
• "Mud" (song), by The Road Hammers from the album Wheels
• "Mud", a song by Peaches from the album I Feel Cream

• Metropolitan Utilities District (MUD), Omaha, Nebraska
• Mud, West Virginia
• Mud village, Spiti, a village in Himachal Pradesh, India
• Mud, Iran, a city in South Khorasan Province
• Mud District, an administrative subdivision in South Khorasan Province
• Mud Rural District, an administrative subdivision in South Khorasan Province
• Mud-e Olya, a village in South Khorasan Province, Iran
• Mud (river), a river of Baden-Württemberg, Germany
• Mud River (disambiguation), several titles
• Municipal utility district, a special-purpose district in the United States that provides public utilities.

• Mark Grant (baseball) (born 1963), nicknamed "Mud", American baseball player and sportscaster
• Mesa de la Unidad Democrática, a Venezuelan electoral coalition
• Middle-Up-Down, a lead convention in contract bridge
• Multi-user dungeon, a multiplayer real-time virtual world (also Multi-user dimension, or Multi-user domain)

• All pages with titles beginning with mud
• All pages with titles containing mud
• MUD1, the first virtual world in video gaming
• MUD2, the successor to MUD1
• MUD Literary Club, originally "Mates of Ubud"
• Mudd, a surname
• Mudd Jeans, a women's clothing brand