NUL may refer to:

• National University of Lesotho
• National Urban League, US civil rights organization
• Nul (band) or NuL, a South African band
• Nul, rulers of a Galactic Empire in Brian Aldiss's Bow Down to Nul
• Nulato Airport (IATA code), airport in Nulato, Alaska

Computers[edit]

• The abbreviation for the null character in many character sets
• The NUL: device in DOS and related systems