Pynns Brook is a local service district and designated place in the Canadian province of Newfoundland and Labrador.
Pynns Brook is in Newfoundland within Subdivision F of Division No. 5.
As a designated place in the 2016 Census of Population conducted by Statistics Canada, Pynns Brook recorded a population of 96 living in 45 of its 73 total private dwellings, a change of from its 2011 population of 107. With a land area of , it had a population density of in 2016.
Pynns Brook is a local service district (LSD) that is governed by a committee responsible for the provision of certain services to the community. The chair of the LSD committee is Tracy Tipple.