Tom may refer to:

As a nickname

• Thomas
• Tomás

Fictional characters

• TOM (Toonami), the host of Cartoon Network's Toonami programming before it became Cartoon Network Too.
• Uncle Tom, a character from the novel Uncle Tom's Cabin by Harriet Beecher Stowe
• Tom Bombadil, a character in the work of J. R. R. Tolkien
• Tom Cat, a character in the MGM Tom and Jerry cartoon series
• Tom Riddle, also known as Lord Voldemort, a main villain character in a Harry Potter book serie written by J.K. Rowling
• Tom Sawyer, a character in several novels by Mark Twain
• Tom, a character in the Van Beuren Studios Tom and Jerry cartoon series
• Tom Scavo, character in TV series Desperate Housewives
• Tom, aka Mr. Friendly, a character in the TV show Lost.

Other uses

• Tom Anderson (MySpace), president and founder of Myspace
• Tom (instrument), a musical instrument
• TOM Group, a Chinese media company
• TOM Online, a Chinese mobile internet company
• Tom River, a tributary of Russia's Ob River
• Tom River (Amur Oblast), a tributary of Russia's Zeya River
• Text Object Model, a Microsoft Windows programming interface
• Territoire d'outre-mer, the French language terms for France's Overseas Territories
• Theory of mind, a concept in cognitive science
• Thomsonfly, an airline, TOM in ICAO code
• Tune-o-matic, a guitar bridge design
• Tan (surname), a Chinese surname
• Tomcat, a male cat
• Translocase of the outer membrane (TOM), a protein for intracellular protein-equilibrium