The home side looked livelier in the early stages, with Dodi Lukebakio going firing over the crossbar from close range inside the opening 10 minutes.
After Marco Reus had a stinging effort saved, Hertha managed to carve out a couple more openings as Matheus Cunha fired wide from close range on 25 minutes before Vladimír Darida saw his shot saved by Roman Burki.
Hertha's pressure finally paid off 10 minutes before the halftime break when Cunha turned home Lukebakio's cross for his fifth goal of the season.
Dortmund were back on level terms two minutes after the halftime break, with Haaland firing into the bottom corner after being picked out by Emre Can.
The turnaround was complete four minutes later as Julian Brandt turned provider to play in Haaland who made no mistake with a close-range finish.
Haaland was not done there as the Norwegian striker completed his hat-trick after showing good pace to get the ball to slot past Alexander Schwolow.
Raphaël Guerreiro got in on the act with 20 minutes left on the clock with a neat finish into the bottom corner for his first league goal of the campaign.
Cunha reduced the deficit for Hertha in the 79th minute from penalty spot, but Haaland had the final say after clinching his fourth and Dortmund's fifth moments after the penalty.
