Look up sludge in Wiktionary, the free dictionary.

Sludge is a semi-solid slurry produced from industrial processes.

Sludge may also refer to:

• Sewage sludge
• Mining sludge
• Biliary sludge
• Oil sludge, a solid or gel in motor oil caused by the oil gelling or solidifying
• Sludge metal, a fusion genre between doom metal and hardcore punk
• Sludge content, a split video format
• Sludge (comics), an Ultraverse comic book
• Sludge (film), a 2005 documentary film by Appalshop filmmaker Robert Salyer
• SLUDGE syndrome, a medical acronym describing the symptoms of overdose or poisoning of certain drugs and pesticides
• Sludge (news), an investigative journalism news outlet covering lobbying and money in politics
• Sludge theory, an economic behavioral theory

• Slurry

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