Tollymore Forest Park is a 630-hectare state forest park at the foot of the Mourne Mountains in County Down, Northern Ireland, near the town of Newcastle.

Established in 1955 as Northern Ireland's first state forest park, it sits within the Mourne and Slieve Croob Area of Outstanding Natural Beauty.

The Shimna River flows through the park, crossed by numerous historic bridges, and supports salmon and trout populations.

The campsite accommodates tents, caravans, motorhomes, and campervans, with facilities including toilets, showers (some wheelchair accessible), fresh water, a chemical toilet disposal point, and electric hook-ups.

The park is open year-round and provides straightforward foot access to the higher Mourne Mountains, including Slieve Donard.

Marked walking trails wind through woodland along the Shimna River, and the park connects to the wider Mourne Way and Ulster Way long-distance routes.