The Diocese of Thailand is one of four dioceses that make up the Ecclesiastical Province (Exarchate) of South-East Asia, established by the Russian Orthodox Church in 2019.

The diocese exercises ecclesiastical jurisdiction over four countries in Southeast Asia, namely Thailand (9 parishes and 1 monastery), Cambodia (3 parishes), Laos (1 parish), and Myanmar (1 parish).

The Diocese of Thailand is headed by the Most Reverend SERGIY, Metropolitan of Singapore and Southeast Asia (interim).