Lightning may refer to the following:

• in meteorology, lightning, the natural electrical phenomenon
• in slang, white lightning (a.k.a. moonshine), a nickname for illegal whiskey
• in North-American sport, the Tampa Bay Lightning, an NHL hockey franchise
• in computing:
  • Mozilla Lightning, an extension for the Thunderbird email client
  • Lightning, a chess engine
• in aeronautics:
  • the P-38 Lightning, a US fighter aircraft of WW2
  • the English Electric Lightning, a supersonic British fighter aircraft