The Thunder Bay Symphony Orchestra is a 31-member professional orchestra based in the Community Auditorium in Thunder Bay, Ontario, Canada. It was founded on 29 November 1960 as the Lakehead Symphony Orchestra, debuting at the Lakeview High School auditorium. The music director is Geoffrey Moull.
Its first conductor was Rene Charrier, who was on his way to Calgary with Doug Dahlgren when they wrecked their car and became stranded in Port Arthur. Saul Laskin, then mayor of Port Arthur, was impressed by their talent and convinced them to stay.
The TBSO tours throughout Northwestern Ontario to bring concerts to communities that would otherwise not have access to a symphony orchestra.