Gloucester County (2021 population 78,256) is located in the northeastern corner of New Brunswick, Canada. Fishing, mining and forestry are the major industries in the county. The eastern section of the county is known for its Acadian culture. The county is named for Princess Mary, Duchess of Gloucester and Edinburgh.

There are 19 municipalities within the county. They are listed below by 2016 population:

There is one First Nations reservation in Gloucester County (listed with 2016 population):

The county is subdivided into ten parishes (listed by 2016 population):

As a census division in the 2021 Census of Population conducted by Statistics Canada, Gloucester County had a population of 78,256 living in 35,830 of its 39,145 total private dwellings, a change of -0.2% from its 2016 population of 78,444. With a land area of 4,734.3 km² (1,827.9 sq mi), it had a population density of 16.5/km² (42.8/sq mi) in 2021.

Highways and numbered routes that run through the county, including external routes that start or finish at the county limits:

47°43′3.6″N 64°49′21.2″W / 47.717667°N 64.822556°W / 47.717667; -64.822556