Fredrik Sjovold's 52nd-minute strike secured a 1-0 victory for Bodo/Glimt over Borussia Dortmund in the Champions League on Wednesday, extending the Norwegian side's remarkable home record against Europe's elite.
Bodo were a cut above the 2024 Champions League runners-up and took the lead through Sjovold just after the break.
Dortmund improved in the final half hour but were unable to strike back, despite a late chance for Felix Nmecha.
Dortmund join Manchester City, Inter Milan and Sporting as recent big-name scalps on the artificial turf of Bodo's Aspmyra stadium.
Bodo's run to the round of 16 last season was underpinned by an excellent record at their 8,200-capacity home, officially the smallest venue in this year's competition.
Dortmund arrived in the Arctic Circle on a seven-game unbeaten run but struggled to get a foothold.
The hosts were far more comfortable in the opening half, with Sondre Fet and Ole Blomberg inches away from scoring.
Bodo continued their domination after half-time and broke through when Sjovold turned a low Sondre Auklend cross in at the near post.
Dortmund's level improved after Niko Kovac made four changes on the hour mark, with Germany midfielder Nmecha forcing a fingertip save from goalkeeper Nikita Haikin moments later.
The Germans upped the pressure in the dying stages but failed to find a way through as they fell to a first defeat this campaign since the season-opening German Super Cup.
