The Liturgy of St. John Chrysostom (, 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.