Concepcion, officially the Municipality of Concepcion (Hiligaynon: Banwa sang Concepcion, Tagalog: Bayan ng Concepcion), is a municipality in the province of Iloilo, Philippines. According to the 2024 census, it has a population of 45,737 people.

It was the capital of the Comandancia de Concepcion, a unit equivalent to a sub-province headed by a Corregidor, before it was merged with the Province of Iloilo.

Concepcion was originally known as Bacjawan, which means "the place of the bacjaw trees," which used to grow in large numbers along the coast's swampy areas. It was formally founded as a pueblo (town) in 1855. The town was later renamed to Concepcion, in honor of the first born daughter of Felizardo Azucena, the town's first captain basal, or gobernadorcillo.

In 1857, the Comandancia de Concepción (Military District of Concepcion) was created. It was a sub-province in Northern Iloilo composed of the capital town of Concepcion, Ajuy, Balasan (modern-day Batad, Estancia, and Balasan), Lemery, San Dionisio, and Sara. It was abolished on April 11, 1901, when the Americans took control of the Philippines and established the civil government of Iloilo. In present days, the former Comandancia de Concepción covers the 5th legislative district of Iloilo except for the towns of Barotac Viejo and San Rafael.

Concepcion is situated in the northeastern part of Panay Island (known as the mainland), along with approximately 16 smaller surrounding islands. It is bordered to the north by San Dionisio, to the south by Ajuy, to the west by Sara, and to the east by the Visayan Sea. The municipality covers a total land area of 9,702.04 hectares.

Concepcion is 97 kilometres (60 mi) from Iloilo City and 101 kilometres (63 mi) from Roxas City.

The largest of the 16 Concepcion Islands is Pan de Azucar at 1,840 hectares (4,500 acres), which has the 573 metres (1,880 ft) high Mount Manaphag rising from its center.

Concepcion is politically subdivided into 25 barangays. Each barangay consists of puroks and some have sitios.