Luigi (Aloysius) Barlassina (30 April 1872, Turin, Italy – 27 September 1947) was an Italian Catholic prelate who was Latin Patriarch of Jerusalem from 1920 until his death in 1947.

In 1911 he worked at the Spiritual College of the Congregation for the Evangelization of Peoples in Rome and from 1912 to 1918 at Vicario Curato at the Lateran Basilica.

He received his episcopal consecration by Cardinal Basilio Pompili on 8 September 1918 in Rome.

Barlassina was known to be an anti-Zionist and his office promoted the reading of The Protocols of the Elders of Zion, an antisemitic fabricated text.

[2] From 1928 until his death in 1947 he was also rector and permanent administrator of the Order of the Holy Sepulchre in Jerusalem (though not grand master).