Riley Brook is a settlement in New Brunswick.
The former local service district of Riley Brook took its name from the community.
Said to be named for a man who drowned there. The Wolastoqey name is Natakayid, possibly meaning "Bald Head place".
In the 2021 Census of Population conducted by Statistics Canada, Riley Brook had a population of 40 living in 21 of its 43 total private dwellings, a change of from its 2016 population of 71. With a land area of , it had a population density of in 2021.