Romain Saiss and Willy Boly scored with first-half headers and Benik Afobe lobbed the keeper after the break to wrap up victory for Wolves.
Nuno Espirito Santo's side had gone three league games without a win and seen their advantage at the summit whittled down from 13 points to three after second-placed Cardiff City beat struggling Barnsley 2-1 on Tuesday.
Victory at Elland Road, however, means that with 11 matches left to play, there is a 10-point gap between Wolves and third-placed Aston Villa, with the top two sides winning automatic promotion to the Premier League.
(Reporting by Toby Davis,; Editing by Ed Osmond)
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