According to the United States Census Bureau, the town has a total area of , of which is land and , or 0.79%, is water. Rockland ranks 307th out of 351 communities in the Commonwealth. Rockland is bordered by Weymouth to the northwest, Hingham to the northeast, Norwell to the northeast, Hanover to the east, Hanson to the south, Whitman to the southwest, and Abington to the west. Rockland is northeast of Brockton and south of Boston.
