The undisclosed transfer fee is believed to be in the region of €25 million.
The Bundesliga side announced the news on Monday, posting a video in which their players deliver their own rendition of The Beatles’ classic ‘Hey Jude’ before the midfielder steps out at the Westfalenstadion.
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Bellingham had been linked with Dortmund for months, but Premier League side Manchester United were also reported to be keen on recruiting the 17-year-old.
Bellingham came through Birmingham’s academy before becoming the club’s youngest ever first-team player when he made his senior debut in the Championship in August 2019. He was 16 at the time.
He has represented England at under-15, U16 and U17 levels.