Limay, officially the Municipality of Limay (Tagalog: Bayan ng Limay), is a municipality in the province of Bataan, Philippines. According to the 2024 census, it has a population of 81,960 people.

Dominican and Franciscan friars settled Limay by the late 1600s, using its rich limestone deposits to build churches in Orion and Balanga. At the time, Limay was a Barangay of Orion.

In the Philippine revolution of 1898, Limay inhabitants fought for their independence. American Governor-General Francis Burton Harrison's Executive Order of January 1, 1917, created Limay as the latest municipality.

In 1913, the Cadwallader-Gibson Lumber Company employed Limayans and Visayan immigrants.

During World War II, Limay hosted the first medical hospital of American and Filipino forces, run by the "Angels of Bataan". In Barrio Lamao, Major General Edward P. King capitulated to the Japanese forces, after the last stand of the American and Filipino forces faltered along the banks of the Alangan River.

In 2024, the 2024 Manila Bay oil spill occurred 3.6 nautical miles (6.7 km) off the east coast of Lamao Point, Barangay Lamao. Governor Joet Garcia declared a no-fishing zone on Limay.

According to the Philippine Statistics Authority, the municipality has a land area of 103.60 square kilometres (40.00 sq mi)  constituting 7.55% of the 1,372.98-square-kilometre- (530.11 sq mi) total area of Bataan.

Limay is accessible via the Bataan Provincial Expressway (N301), off Exit 45. It is 12 kilometres (7.5 mi) from Balanga and 136 kilometres (85 mi) from Manila.