Green Island Brook is a local service district and designated place in the Canadian province of Newfoundland and Labrador.

Green Island Brook is in Newfoundland within Subdivision C of Division No.

[2] As a designated place in the 2016 Census of Population conducted by Statistics Canada, Green Island Brook recorded a population of 143 living in 69 of its 83 total private dwellings, a change of -11.2% from its 2011 population of 161.

[1] Green Island Brook is a local service district (LSD)[3] that is governed by a committee responsible for the provision of certain services to the community.

[4] The chair of the LSD committee is Donald Macey.