LT, L.T., Lt, or lt may refer to:

• less than
• LT, Lithuania (ISO 3166-1 alpha-2 country code)
• lt, Lithuanian language (ISO 639 alpha-2)
• Lieutenant
• Lorentz transformation
• L.T., The nickname of Lawrence Taylor or LaDainian Tomlinson.
• AutoCAD LT , a CAD application from Autodesk.
• the IATA code for LTU International airlines.