Holy Trinity Church (Russian: Церковь Святой Троицы) is a small Russian Orthodox church on King George Island near Bellingshausen Station, a Russian research station in Antarctica. It is one of the eight churches on Antarctica. It is the southernmost Eastern Orthodox church in the world (cf. St. Ivan Rilski Chapel).
The ambitious project to establish a permanent church or monastery on Antarctica first materialized during the 1990s. A charity named "Temple for Antarctica" (Храм - Антарктиде) was approved by Patriarch Alexius II and received donations from across Russia. They organized a competition for the project that was won by architects from Barnaul P.I. Anisifirov, S.G. Rybak and A.B. Schmidt.
The church is a 15m-high wooden structure built in traditional Russian style. It can accommodate up to 30 worshippers. The structure was built out of Siberian Pine by Altay carpenters led by K.V. Khromov, then dismantled, taken by truck to Kaliningrad and shipped to King George Island by the Russian supply ship Academician Vavilov. It was assembled on high ground near the seashore by the staff of Bellingshausen Station, under the general supervision of the 30-year-old Father Kallistrat (Romanenko), who was to become the church's first priest. Kallistrat, a hieromonk of Troitse-Sergiyeva Lavra, had previously served at the Lavra's skete on Anzer Island in the subarctic Solovki Archipelago.