Tom or TOM can refer to:

• A male cat, or "tom".
• A character in the cartoon series Tom and Jerry.
• A tom-tom drum.
• Territoires d'outre-mer (TOM), the French Overseas Territories.
• The Slovenian term Temeljna obrestna mera (TOM).
• A "Tom" or "Uncle Tom", African-American slang for an obsequious, servile, or witless person.
• "Tom", Tudor English slang for lunatic.
• "Tom", modern English slang for God.
• One of two Tom Rivers in eastern Russia.
• The Theory of mind.