Coordinates: 47°54′56″N 3°20′02″W / 47.9156°N 3.3339°W / 47.9156; -3.3339

Plouay (Breton: Ploue) is a commune in the Morbihan department in Brittany in north-western France.

Plouay hosts the GP Ouest-France and the GP de Plouay, an annual cycling race (a men's and women's race, respectively). It was also the location of the World Championships of Cycling in 2000. The Tour de France has visited this town three times: in 1998, 2002 and in 2006.

Plouay is twinned with Pershore in England.

Inhabitants of Plouay or Ploue are called Plouaysiens in French and Plouead (Ploueiz), Ploueadez (-ed) in Breton.

The municipality launched a linguistic plan through Ya d'ar brezhoneg on February the 10th of 2006.

In 2008, 11,56% of the children in Plouay attended Breton-French bilingual classes in primary education.

Marc Madiot (born April 16, 1959 in Renazé) is a French former professional road racing cyclist and double winner of Paris–Roubaix. Retired from racing in 1994, he is now best known as the directeur sportif of FDJ-BigMat, a UCI ProTour cycling team.

In 2008 he was made a knight of the French Legion of Honor. It was presented by French president Nicolas Sarkozy at the Elysée palace in Paris.