Dortmund reach Bundesliga record
Shinji Kagawa scored the only goal of the game in the eighth minute, although Dortmund should have won more comfortably given the number of chances they created.
"My only criticism is that we didn't take our chances earlier, we left the game open for too long," said Dortmund coach Jurgen Klopp. "Consequently, we weren't sure of the win until the very end. But I was very happy with the performance, we were very alert and alive."
Dortmund took the lead when they broke from a corner, with Kevin Grosskreutz lifting the ball to the far post to Ilkay Gundogan, who selflessly and intelligently lifted it back across goal for Kagawa to nod in from close range.
Werder's reaction was a shot from 25 yards by Mehmet Ekici, but apart from that effort, it was a one-sided encounter at the Westfalenstadion. The only surprise was that Dortmund failed to add to their opening goal in the remaining 82 minutes.
Kagawa himself could have had a hat-trick. He was denied a second by Sebastian Mielitz's fingertips as the Werder goalkeeper pushed the Japan international's 20-yard shot onto the post.
Kagawa then missed the best chance of the second half in the 54th minute when he pounced on a loose ball in the six-yard box, but somehow shot wide of the post when it seemed easier to hit the target.
Sebastian Kehl also hit the woodwork with his header hitting the crossbar and bouncing down on, but not fully over, the goalline, while Robert Lewandowski curled a shot wide. Kagawa had another effort deflected wide as Dortmund dominated.