St. Olave's Church or St. Olav's Church, or variants thereof, refers to churches dedicated to Olaf II of Norway, and may refer to:
England
St Olav's Norwegian Seamen's Church, London, the English name for Sjømannskirken, London St Olave's Church, Chester, Cheshire St Olave's Church, Gatcombe, Isle of Wight St Olave's Church, Hart Street, London St Olave's Church, Old Jewry, London St Olave's Church, Silver Street, London St Olave's Church, Southwark, London St Olave's Church, York, Yorkshire St Nicholas Olave, London
Norway
St. Olav's Church of Avaldsnes, the formal name for Avaldsnes Church
St. Olav's Church (ruin) in Bamble, Telemark
St. Olav's Church, Bergen, incorporated into the current Bergen Cathedral
St. Olav's Cathedral, Oslo () St. Olav's Cathedral, Trondheim ()