Aghagallon (from Irish Achadh Gallan ^ⓘ, meaning 'field of the standing stones') is a small village and civil parish in County Antrim, Northern Ireland. It is about four miles (6 km) northwest of Moira, County Down. The village population was 1,175 at the 2021 census, compared with 824 in the 2001 census.

Aghagallon has mainly developed along Aghalee Road in a linear fashion with development to the southeast along Colane Road. St Patrick's Church and the adjacent primary school are in the middle of the village. Although the village is named after the townland of Aghagallon, it lies almost wholly within neighbouring Derrynaseer townland.

The village has two primary schools, St Patrick's Primary School (Aghagallon) and St Mary's Primary School, Gawley's Gate (Derrymore).

Aghagallon is classified as a small village or hamlet by the NI Statistics and Research Agency (NISRA) (i.e. with population between 500 and 1,000 people).

On census day (29 April 2001) there were 824 people living in Aghagallon village. Of these:

In the 2001 census the resident population of Aghagallon Ward was 3,806 (including the village), of whom:

The population for the civil parish of Aghagallon in 2010 was estimated at 4,586, of which 25.4% were children, 32.1% were young working age adults, 29.9% were older working age adults and 12.6% were older people. Young working age adults are defined as 16- to 39-year-olds, and older working age adults as males 40–64 and females 40–59 years. This represents an increase of 20.1% (768 individuals) from the estimated mid-year ward population in 2001.

The Farm Census 2010 recorded 89 farms registered to addresses in Aghagallon, and the total agricultural labour force was 170 persons.