Oratoire de Saint-Guirec, Gothic oratory at Ploumanach beach, Perros-Guirec, France.

The Oratory of Saint-Guirec is a Gothic stone structure that sits on a rocky ledge at Ploumanach beach, supported by arches. The construction displays architectural details including a niche that holds a granite sculpture of the saint.

The oratory was probably built by Cistercian monks of Bégard Abbey; sources date it between the late 11th and early 12th centuries, while the French monuments administration places it in the first half of the 13th century, consistent with its transition from Romanesque to Gothic. It was classified as a historic monument on 10 February 1903. The 14th-century wooden statue was moved to the nearby Saint-Guirec chapel in 1904 and replaced by a granite copy by the Lannion sculptor Hernot.

The oratory is dedicated to Saint Guirec, a Breton local saint and companion of Bishop Tugdual. Unmarried women and widows once waited for low tide to prick the wooden statue's nose with a pin; if the pin stayed in place, they believed they would marry within the year. The rite, still alive in the 19th century, now continues with pine needles or pebbles left at the statue's feet.

Access to the oratory depends on the tides - at low tide visitors can walk directly across the rocks, while at high tide the structure becomes surrounded by water. It is wise to check tide times and bring weather-resistant clothing plus sturdy shoes.

The capital of the rear right column is carved with a ram's horn motif, a detail easily missed among the four Romanesque columns. The foundation stones on the right side appear to come from an Iron Age Gaulish stele, reused in the base of this medieval edifice.