Die Dreifaltigkeitskathedrale (rus. Petropavlovsk-Kamchatsky Cathedral of the Life-Giving Trinity) ist eine in Petropawlowsk-Kamtschatski gelegene russisch-orthodoxe Kathedrale und Bischofssitz der Eparchie Petropawlowsk-Kamtschatskaja.

The construction of the cathedral, designed by the architect Oleg Lukomski in the Old Russian style, began in September 2000. In May 2007 the cathedral was crowned with domes. There is a concert hall on the ground floor. The interior walls of the cathedral are painted with scenes from the history of Orthodoxy in Kamchatka and historical events, including the defense of Petropavlovsk-Kamchatsky in 1854, when the triple superior forces of the British and French were defeated by the Russians. On September 19, 2010 it was consecrated by Patriarch Cyril I.

In 2017 a 45 meter high bell tower was completed near the cathedral.