Luke Amos’ late winner took QPR up to fourth in the Championship table.
Amos, recently back from the second long-term knee injury of his career, headed in Chris Willock’s cross with nine minutes remaining at the Kiyan Prince Foundation Stadium.
The lively Willock did superbly on the right flank and Amos, on as a substitute, was in front of keeper Lee Nicholls to finish from close range.
It preserved Rangers’ record of being the only team in the division to have scored in all their league matches so far this season.
Mark Warburton’s side are now unbeaten in five matches – a run which has included three wins and three clean sheets.
They laboured without injured striker Lyndon Dykes but were eventually rewarded for their persistence.
Huddersfield always looked dangerous and Ollie Turton had a couple of early chances to put them ahead.
In only the second minute, keeper Seny Dieng blocked Turton’s far-post header from Harry Toffolo’s cross.
And Turton blasted wastefully over following a swift counter-attack as the visitors had the better of the opening exchanges.
QPR created very little before almost going ahead against the run of play when Yoann Barbet’s flicked header from Stefan Johansen’s right-wing corner bounced off the bar.
That brought Rangers to life and they went close again when Lee Wallace’s strike was deflected over by Turton.
They finished the first half strongly, with Charlie Austin seeing a goal-bound effort blocked by Levi Colwill and then sending a right-footed strike over the bar.
The hosts continued to press after the interval and Austin was put through by Andre Dozzell but fired straight at Nicholls, who also held a shot from Ilias Chair.
Nicholls was given a stiffer test by a left-footed strike by Johansen from near the edge of the penalty area, which he also kept out.
Rob Dickie drilled a shot narrowly wide and Chair missed a great chance when he scooped over after being teed up by Johansen.
At the other end, Dieng saved at his near post to deny Danel Sinani and Matty Pearson was just unable to connect with Koroma’s free-kick before Amos broke the deadlock.
QPR: Dieng; Dickie, Dunne, Barbet; Adomah, Dozzell (Amos 71), Johansen (Ball 90), Wallace; Chair, Willock, Austin (Field 83).
Subs not used: Archer, Kakay, Thomas, Field, Duke-McKenna.