Mario Vrancic handed the Canaries an early lead after five minutes with a stunning free-kick, following a foul on Onel Hernandez.
The Bosnian international then turned provider for their second as he set Teemu Pukki up to poke in his deflected shot and double their lead at the break.
Vrancic then got his second 15 minutes from time, flicking Jamal Lewis’ pullback under Kiko Casilla’s legs to wrap up victory, despite Patrick Bamford heading in an injury-time consolation for Leeds.Embed from Getty Images
With that win, Norwich are now top on goal difference from The Whites with Sheffield United now three points behind in third, after second half strikes from David McGoldrick and Billy Sharp.
West Brom met Middlesbrough at the Hawthorns in a massive play-off showdown and it proved to be an eventful affair, which could prove decisive come 5th May once the season is done.
Boro opened the scoring 17 minutes in when George Saville intercepted Gareth Barry before racing through and firing beyond Sam Johnstone.
Jay Rodriguez then levelled things at the break with a poke in before Gayle struck shortly after the hour mark, when he collected a poor clearance and weaved to left before firing in via deflection to put the Baggies on course for all three points.
Tony Pulis then rung the changes with Britt Assombalonga coming on in 65th minute and eight minutes later, he tucked away a pass from Jordan Hugill.Embed from Getty Images
Another eight minutes later and the comeback was complete when Chris Brunt who mishit the ball, allowing Assombalonga to intercept and turn in as the Teessiders moved level on points behind fourth-placed West Brom.
Derby dropped out of the play-offs on goal difference after being held to a goalless draw at Preston, as Bristol City moves into sixth following a 2-0 home win over Swansea.
Down at bottom, Millwall’s goalless draw with Rotherham means that the bottom three remain as they were, although Reading are now a point from safety after holding Aston Villa to a 0-0 draw at the Madejski Stadium.
Ipswich remain rock bottom after Lucas Joao turned in Adam Reach’s last minute pass as Sheffield Wednesday claimed their first win under Steve Bruce.
Elsewhere Birmingham and Hull are both four points outside the play-offs after picking up respective 2-0 home wins over Nottingham Forest and Stoke.
Griffin Park saw the biggest thriller of this weekend take place between two in-form teams as Brentford met Blackburn Rovers.Embed from Getty Images
Bradley Dack and Danny Graham helped Rovers to an early two goal lead after seven minutes, only for Said Benrahma to half the deflict six minutes later with a beautiful curl into bottom right from the left.
Brentford who have a midweek FA Cup replay against Barnet clearly viewed this clash as a bigger priority after the break, as Ollie Watkins netted a brace to turn the game on its head before Neal Maupay and Sergio Canos completed a comeback 5-2 win, to make it nine matches unbeaten in all competitions for the Bees.
Finally, Wigan moved seven points clear of the drop after seeing off QPR 2-1 through Josh Windass and Leon Clarke strikes despite a late consolation from Bright Osayi-Samuel for the Hoops.