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