The 27-year-old, who was making his 100th appearance for the club got his team’s third goal to lift Danny Cowley’s men from relegation waters at the Kirklees Stadium.
After a goalless first half, Karlan Grant and Juninho Bacuna handed the hosts a two-goal lead before Kachunga slided home Lewis O’Brien’s low ball in the Yorkshire derby.
The goal ended a run of 22 months without a goal for Huddersfield in all competitions.
The striker’s recent poor form is in sharp contrast to his debut season (12 goals in 44 appearances) following his move from Germany’s Ingolstadt.
Kachunga failed to find the target in 20 games last season as the Terriers got demoted from the Premier League.
My bro ❤️ https://t.co/qvlUQFEBwU— Elias Kachunga (@ekachunga15) October 5, 2019
He was on parade for the duration while Benin Republic’s Steve Mounie was an unused substitute.
The victory lifted Cowley’s team above the relegation zone but share the same points with 17th placed Reading.
Next up for Huddersfield is a fixture against Blackburn Rovers at Ewood Park in the Championship on October 19.