Let's Do It may refer to:

• Let's Do It 2008, an environmental cleanup campaign in Estonia
  • Let's Do It! World, an international civic movement that originated from the Estonian campaign
  • Let's do it! Armenia, an environmental cleanup campaign in Armenia
• "Let's do it!", the last words of the American criminal Gary Gilmore in 1977

• "Let's Do It", or "Let's Do It, Let's Fall in Love", popular song by Cole Porter
• Let's Do It (album) (1972), by Roy Ayers
• Let's Do It (TV series), 1974 Canadian sports instruction series
• "Let's Do It" (The L Word), 2002 episode of The L Word
• "Let's Do It" (Miranda), episode of Miranda

• "O Let's Do It", a song by Waka Flocka Flame
• Let's Do It Again (disambiguation)