Saint Isaac may refer to: People Isaac, son of Abraham in the Old Testament Saint Isaac of Dalmatia (4th-century–383) Saint Isaac of Monteluco, also called St. Isaac of Spoleto (died c. 550) Saint Isaac Jogues (1607–1646) Saint Isaac of Dafra Saint Isaac of Armenia (338–439) Saint Isaac of Nineveh (died c. 700) Buildings, structures, and places Saint Isaac's Cathedral, in Saint Petersburg, Russia Saint Isaac's Square, in Saint Petersburg, Russia Saint Isaac's Bridge, the first bridge across Neva river in St.Petersburg, Russia