St. Olaf's Church, or variants thereof, refers to churches dedicated to Olaf II of Norway, and may refer to:
Denmark St. Olaf's Church, Helsingør, () Sankt Ols Kirke, Bornholm
Faroe Islands Saint Olav's Church, Kirkjubøur
Estonia St. Olaf's Church, Tallinn () St. Olaf's Church, Nõva () St. Olaf's Church, Vormsi () St. Olaf's Church ruins, Väike-Pakri () St. Olaf's Chapel ruins in Suur-Pakri ()
Finland St. Olaf's Church, Jomala, Åland Islands () St. Olaf's Church, Jyväskylä () St. Olaf's Church, Tyrvää, Sastamala () St. Olaf's Church, Ulvila ()
Norway St. Olaf's Church, Balestrand
Russia Saint Olaf's Church in Novgorod
United Kingdom St Olaf's Church, Poughill, Bude, Cornwall St Olaf's Church, Wasdale, Cumbria St Olaf's Church (Balliasta), Unst, Shetland St Olaf's Church (Cruden), Cruden, Scotland St Olaf's Church (Lunda Wick), Unst, Shetland St Olaf's Church (Voe), Shetland Mainland
United States St. Olaf Kirke, a historical Lutheran church located near Cranfills Gap, Texas
See also St. Olave's Church