Orientales Ecclesiae is Latin for "Eastern Churches", and is used to refer to the Eastern Catholic Churches.
The term can also be a misspelling for the titles of either of two encyclicals of Pope Pius XII:
Orientalis Ecclesiae – issued April 9, 1944, on St. Cyril, Patriarch of Antioch Orientales Ecclesias – issued December 15, 1952, on the persecution of the Eastern Churches