St. Olaf can refer to:

People

• Saint Olaf, King Olaf II of Norway
• Saint Olaf of Sweden, King Olof Skötkonung

Institutions

• St. Olaf College, a private, liberal arts college in Northfield, Minnesota
• St. Olaf Choir, the a cappella choir of St. Olaf College

Places

• St. Olaf, Iowa, United States
• St. Olaf Township, Minnesota, United States
• St. Olaf, Minnesota, a fictional town referred to in the television series The Golden Girls
• St. Olaf's church, 12th century church in Tallinn, Estonia, the world's tallest building from 1549 to 1625
• Olavinlinna (St. Olaf's Castle), 15th century castle in Savonlinna, Finland
• St. Olaf Kirke, a historical Lutheran church located near Cranfills Gap, Texas, United States

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