Rock Island is an unincorporated community in Stanstead, Quebec, Canada. It is recognized as a designated place by Statistics Canada.
In the 2021 Census of Population conducted by Statistics Canada, Rock Island had a population of 927 living in 416 of its 459 total private dwellings, a change of from its 2016 population of 897. With a land area of , it had a population density of in 2021.