Tam Toa is an old Catholic church in Dong Hoi, nowadays the capital of Quang Binh Province in central Vietnam. It was built in the late 19th century and was destroyed by American bombs on 11 February 1965, during the Vietnam War and has remained in ruins ever since. The building belongs to one of the oldest Catholic parishes in Vietnam.

Its roots date back to the mid 17th century AD, and efforts to restore it have led to a conflict with the local government who wants to keep it undisturbed as a war relic.