Abucay, officially the Municipality of Abucay, (Filipino: Bayan ng Abucay), is a municipality in the province of Bataan, Philippines. According to the 2024 census, it has a population of 44,846 people.

The first printing press in the archipelago was found in this town. Tomas Pinpin, the first Filipino printer, learned the art from Fray Francisco Blanca de San Jose and Juan de Vera, a Chinese printer at the University of Santo Tomas^{[citation needed]}.

On June 23, 1647, a fierce battle was fought between the Dutch invaders and the Pampango defenders in the near the Abucay church area. Nearly 200 Pampangos were put to death and 40 others together with Pampanga’s Spanish alcalde mayor (town mayor) Antonio de Cabrera. Dominican priests Father Geronimo Sotomayor and Father Tomas Ramos were taken to Batavia.

The Municipality of Abucay borders Balanga (the capital city) to the south, Samal to the north and northwest, Morong to the west, and the Manila Bay to the east. The town is accessible via the Bataan Provincial Expressway, off Exit 25, or the parallel National Road in Bataan. Its westernmost elevated section is located within the Bataan National Park.

According to the Philippine Statistics Authority, the municipality has a land area of 79.72 square kilometres (30.78 sq mi) constituting 5.81% of the 1,372.98-square-kilometre- (530.11 sq mi) total area of Bataan.

The topography of Abucay varies from the mountainous terrain of Mount Natib caldera in the west to the coastal areas of the province along the shore of Manila Bay. Six rivers with a combined length of 37 kilometres (23 mi) originate from the mountain flowing in the west-to-east direction.

Abucay is situated 4.78 kilometres (2.97 mi) from the provincial capital Balanga, and 117.79 kilometres (73.19 mi) from the country's capital city of Manila.

Abucay is politically subdivided into 9 barangays. Each barangay consists of puroks and some have sitios.