An 89-year-old man was seen for worsening left hip pain. He had a history of bladder cancer status post-transurethral resection of bladder tumor followed by intravesicular instillations of bacillus Calmette-Guérin (BCG). About one year later, he developed worsening pain in his left prosthetic hip that continued to worsen over the next three months. A computed tomography scan of the hip revealed loosening hardware and periprosthetic fluid collection. Aspiration and operative cultures revealed Mycobacterium bovis BCG. Susceptibility testing revealed resistance to pyrazinamide. The patient underwent a surgical washout with retention of hardware. Treatment with isoniazid, rifampin, ethambutol, and pyridoxine was initiated. This case highlights an extremely rare and delayed complication of intravesicular BCG leading to prosthetic joint infection.