Château du Plessis, Historical castle in Argentré-du-Plessis, France.

Château du Plessis is a castle located in Argentré-du-Plessis in the Breton countryside. Its southern facade displays architectural elements from the 15th through 19th centuries, reflecting successive renovations and additions made over time.

The site began as a medieval castle of the du Plessis d'Argentré family, with foundations from the 12th century and a square tower built in the 14th century. On 31 July 1791 the national guards of Bais and Vitré searched the presbytery of Étrelles, then visited the castle and caused major damage. It was remodelled in a Neo-Renaissance style around the middle of the 19th century and was listed as a monument historique on 30 October 2000.

The castle takes its name from the du Plessis family of Argentré, its medieval founders. Since 2000 it has belonged to the American Thomas Bell and his wife, so the line of owners changed at the turn of the 21st century. The square tower raised in the 14th century is the oldest standing element a visitor can pick out.

Access to the castle requires advance planning since it is not open to the public on a regular basis. Visitors should check conditions ahead and arrange their visit according to availability.

The square tower dates from the 14th century, while some foundations go back to the 12th century, making them the oldest parts of the building. The neo-Renaissance remodelling of the mid-19th century gave the facade its present appearance. The castle has belonged to the American Thomas Bell and his wife since 2000.