Since joining BVB from Cerezo Osako in 2010, the Japan international has now notched up 38 goals in 132 Bundesliga appearances.
The 28-year-old moved level with previous record holder former Mainz and Stuttgart striker Shinji Okazaki on 37 with his strike in the 3-0 win over Hamburg on Matchday 5, but has now surpassed his international teammate after scoring with a delicate chip to put Dortmund 2-1 away to Augsburg on Matchday 7.
"At first we didn't know whether Shinji had chipped the goalkeeper, or if it had been deflected," Dortmund head coach Peter Bosz said after the game. "That is quality. He hit it exactly how he wanted to."
Watch: The pick of Kagawa's 38 Bundesliga goals
Kagawa's first Bundesliga goal came on Matchday 3 of the 2010/11 campaign when he struck in a 2-0 home win over Wolfsburg and one week later, he scored a brace in a 3-1 Revierderby victory away at Schalke it what was a dreams start at his new club.
He went on to find the net another 20 times in two seasons at BVB, becoming a firm fan favourite thanks to his tireless work ethic and eye-catching skill on the ball, before Joining Manchester United in July 2012.
After a two-year spell in England, Kagawa returned to Dortmund in the summer of 2014. He has re-established himself in midfield with his customary composed displays and was recently rewarded with a contract extension valid until 2020.