Ben Boyd National Park is a national park in New South Wales, Australia, 383 km (238 mi) south of Sydney. The park is named after the entrepreneur Ben Boyd who had a variety of interests in the far South Coast of New South Wales including whaling and farming. The park itself was established in 1971. Originally 8,900 hectares in size, it has been expanded to 10,486 hectares. Boyd commissioned the construction of a sandstone tower overlooking The Entrance to the harbour of Twofold Bay to alert whaling crews of the approach of their prey. The tower was never completed.
The park consists of two sections, on either side of Twofold Bay and the town of Eden. The smaller northern section is bounded on its western border by the Princes Highway. The geology of this section is mainly sedimentary rock (ironstone and clay) laid down in the Paleogene, with some quartzite outcrops. The main attraction for tourists is the Pinnacles, a multicoloured erosion gully with white sands overlaying rusty red clay. The southern section coastline is metamorphic and Devonian in age, with some heavily folded sections at Red Point, near Boyd's tower.