:''For the ''Book of Common Order'', sometimes called ''The Order of Geneva'' or ''Knox's Liturgy'', see that entry.''
The Euchologion (Greek: ; Slavonic: Молитвословъ, ''Molitvoslov'' ; (ルーマニア語、モルドバ語():Euhologiu/Molitfelnic)) is one of the chief liturgical books of the Orthodox Church and Eastern Catholic Churches, containing the portions of the services which are said by the bishop, priest, or deacon (it corresponds more or less to the Roman Catholic Missal, (Ritual ), and Pontifical combined). There are several different volumes of the book in use.
==Types of Euchologia==
A. The comprehensive version is called the Great Euchologion (Greek: ''Εὐχολόγιον τό μέγα'', ''Euchológion to méga''; Slavonic: ''Болшой Иерейсий Молитвословъ'', ''Bolshói Ieréisky Molitvoslóv''; Romanian: ''Arhieraticon''), and contains the following:
*The parts for the priest and deacon at Vespers, Orthros (Matins), and the Divine Liturgy, together with supplementary material (Prokeimena, Calendar of Saints, etc.)
*The remaining Sacred Mysteries (Sacraments), monastic Tonsure, Blessing of Waters, etc. The texts for these and the following services are provided in full.
*Services performed by a Bishop (Ordination, Consecration of a Church, etc.)
*Various blessings and prayers for occasional use (Blessing of a House, Visitation of the Sick, Funerals, etc.)
*Services of Supplication (Molebens)
:(For a full description of the contents and order of the Great Euchologion, see below, under Content)
B. The other books contain only portions of the Great Euchologion:
* The Priest's Service Book (Greek: Ἱερατικόν, ''Hieratikon''; Slavonic: Слѹжебникъ, ''Sluzhébnik''; Romanian: ''Liturghier'') containing Vespers, Matins, Compline and Divine Liturgy, plus supplementary material
*The Small Euchologion or Book of Needs (Greek: Ἁγιασματάριον, ''Hagiasmatárion''; Μικρόν Εὐχολόγιον, ''Mikron Euchológion''; Slavonic: Требникъ ''Trébnik''; Romanian: ''Molitfelnic'') contains the Mysteries (except Liturgy) which would be used by a priest, as well as the other services that would be commonly called for in a parish.
* The Ritual or Pontifical (Greek: Ἀρχιιερατικόν, ''Archieratikon'', Slavonic: Чиновникъ, ''Chinovnik''; Romanian: ''Arhieraticon'') contains the portions of Vespers, Matins, Liturgy and the Mysteries that are performed by a Bishop.
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