Plouzané comes from the Breton "plou" (parish) and from Sané, a Breton saint.

The territory of Plouzané (instead of the Cloître - Ar Cloastr) was the place of hermitage of Saint Sané. Saint Sané is from Hybernia like Saint Ronan. He landed on the Perzell beach, near Bertheaume, in Plougonvelin. He died in Ireland around the year 480.

The original parish of Plouzané once included Loc-Maria-Plouzané, Saint-Pierre-Quilbignon and part of Saint-Renan. Plouzané became a town in 1790.

We find the following appellations: Ploesanae (around 1330), Ploesannay (in 1407), Ploesane (in 1440), Ploesane (in 1481), Ploesanne, Guysane (in 1544) and Guic-Sané (in 1636).

the Saint-Sané church (1775-1781), built by the company Julien Le Jumble on the plans of Pierre Joachim Besnard (engineer of Bridges and Roads in Landerneau). The blessing took place on June 25, 1781. The early church was built, it seems, according to Albert Le Grand, on the site of a temple of false gods. In the place of the church of Loc-Maria-Plouzané (formerly Loc Maria Lanvénec) there was a small oratory dedicated to idols and transformed into a sanctuary by Saint Sané: the church of Loc Maria was rebuilt in 1755. In the shape of a cross , the current church of Plouzané comprises a nave of three bays with aisles, then a transept of three bays with double aisles and wings ending in a hemicycle, and a choir of one span with aisles and apse in hemicycle . Its portal with pediment and Doric columns is surmounted by a circular gallery surrounding the base of the bell tower: we can read the name of the rector Inizan and the date 1779. The modern stained glass windows represent among others Saint Sané. A bell, cast by Lépine, dates from 1787. The baptismal font dates from 1675. The reliquary of Saint Sané dates from the end of the 17th century. The church houses the statues of Saint Sané and Saint Yves;

the Notre-Dame-de-Bodonnou chapel (15th century), restored in the 19th and 20th centuries and located not far from the old manor of Keredec, which once belonged to the Lord of Hunting of Andigné, adviser to the Parliament of Brittany. It is a rectangular building formerly divided in two by a diaphragm arch on which the steeple stood. During a restoration in 1822, the eastern part was removed and the steeple transferred to the western gable. The chapel is dated 1544 and was also restored in 1732, then in 1958. A holy water font bears the arms of the Chastel family. The chapel houses the statues of Saint Barbara, Saint Gouesnon as bishop, a holy monk and a 16th century granite Virgin-Mother;

the Chapel of the Trinity (14th-16th century), restored in the 19th and 20th centuries. It is a rectangular building with a south aisle of four bays and a wing chapel on this aisle to the right of the third bay. The chapel was blessed on October 19, 1952. The small ogival style bell tower was rebuilt around 1876. The "counter-curved and foliage" portal, terminated by a large finial, is joined by two pinnacles with crossettes. The chapel houses the statues of Saint Anne, Saint Hubert, Saint Eloi, the Virgin Mother and has a statue of Saint Peter in Kersanton (outside);

the Langongar chapel. It is a small rectangular oratory built with materials from the old 16th century chapel. He wears the quartered shield of Mol et du Dresnay;

the private chapel of Kerangoff. It is a rectangular building dedicated to Our Lady of the Angels;

the old chapels of Plouzané, which no longer exist today: the chapel of Notre-Dame de Mezares and the oratory of the Rosary

the fountain of the Trinity (16th century);

Also to be noted:

the Christianized stele of Kerascoët (Iron Age, 16th century);

the Christianized stele of Notre-Dame-de-Bodonnou (Iron Age);

the Fort du Minou (17th century);

the fort of Dellec (18th-19th century);

the fort of Mengant (1684);

the old manor of Coaténez, nicknamed the "Devil's Castle". In the 15th century, Coaténez belonged to a younger branch of the Quilbignon family. In the 17th century, Coaténez was owned by a younger branch of the Penmarches, later melted in Le Vayer de Kerandantec. Right next to the castle was a fountain (feunteun an diaoul, the Devil's fountain).