Rudy Austin, Mirco Antenucci and Souleymane Doukara scored as Leeds United bossed the latest West Yorkshire derby.
There was little to excite fans of either side before midfielder Austin broke the deadlock in the 19th minute, drilling the ball home from just inside the penalty area after Joel Lynch's clearance took a deflection into his path.
Harry Bunn was busy down the left as Town tried to respond, but Jonathan Hogg headed wide from his cross before Bunn drilled a decent chance across the face of goal.
Huddersfield Town suffered a major setback when Leeds claimed their second on the counter-attack in time added on.
Italian striker Anttenucci broke and after Giuseppe Bellusci's chip rebounded off the bar, he fired in the rebound.
The goal left Town, who had enjoyed plenty of possession but once again struggled to turn it into meaningful chances, facing a steep uphill task.
Mark Hudson was wide with a couple of headers early in the second half, while Jason Pearce blocked from Nahki Wells as he met another Bunn cross.
Town brought on Danny Ward for Hogg and the newcomer brought a good block from keeper Marco Silvestri as he met Bunn's cross.
But Leeds put the game beyond reach in the 69th minute, when Doukara ran onto Austin's pass and curled a shot last Alex Smithies.
The home side had the already booked Gaetano Berardi red carded after he fouled Bunn in the 73rd minute.
The sending off came too late to have any effect on the game and Leeds came close to another goal when Antenucci broke and had a low shot deflected against the outside of the right-hand post.