Patriarch Alexy I of Moscow
| His Holiness Alexy I | |
|---|---|
| Patriarch of Moscow and all the Rus' | |
| Alexy I in 1945 | |
| Church | Russian Orthodox Church | 
| See | Moscow | 
| Installed | 4 February 1945 | 
| Term ended | 17 April 1970 | 
| Predecessor | Sergius I | 
| Successor | Pimen I | 
| Orders | |
| Ordination | 3 January 1904 | 
| Consecration | 11 May 1913 by Gregory IV of Antioch | 
| Personal details | |
| Born | Sergey Vladimirovich Simanskiy November 8, 1877 | 
| Died | April 17, 1970 (aged 92) Peredelkino, Moscow Oblast, RSFSR, Soviet Union | 
| Buried | Trinity Lavra of St. Sergius | 
| Nationality | Russia | 
| Denomination | Eastern Orthodoxy | 
| Alma mater | Imperial Moscow University (1899) Moscow Theological Academy | 
Patriarch Alexy I (Alexius I, Russian: Патриарх Алексий I, secular name Sergey Vladimirovich Simansky, Russian: Серге́й Влади́мирович Сима́нский; November 8 [O.S. October 27] 1877 – 17 April 1970) was the 13th Patriarch of Moscow and all Rus', Primate of the Russian Orthodox Church (ROC) between 1945 and 1970.