TNT is a three-letter abbreviation with multiple meanings, including:

• Trinitrotoluene, a chemical explosive.
• The common name for Turner Network Television, a cable television network.
• TNT-9, is a television station in Launceston, Australia.
• Thomas Nationwide Transport is now part of TPG NV (formerly TNT Post Group), a logistics corporation.
• T.N.T. is a 1975 album by the heavy metal group AC/DC.
• TNT is a Norwegian heavy metal band.
• TNT is an obscure comic book superhero.