The Liturgy of St. John Chrysostom (Russian: Литургия святого Иоанна Златоуста, Liturgiya svyatogo Ioanna Zlatousta) is an a cappella choral composition by Pyotr Ilyich Tchaikovsky, his Op. 41, composed in 1878. It consists of settings of texts taken from the Divine Liturgy of St. John Chrysostom, the most celebrated of the eucharistic services of the Eastern Orthodox Church. Tchaikovsky's setting constitutes the first "unified musical cycle" of the liturgy.

Librettist Russian Orthodox liturgy
Date of composition 1878
Premiered June 1879 (University Church) in Kiev, Kyiv city, Ukraine
First published 1879 in Moscow, Russia
Type Religious work
Catalogue Op. 41
Approx. duration 48 minutes
Spoken language Slavon
Instruments Chorus/Choir - Mixed Chorus ;
Autotranslations beta Piotr Ilitch Tchaïkovski: Liturgy of St. John Chrysostom, Op. 41
Pëtr Il'ič Čajkovskij: Liturgy of St. John Chrysostom, Op. 41
Pjotr Iljitsch Tschaikowski: Liturgy of St. John Chrysostom, Op. 41