Beecroft Peninsula is a peninsula located to the north and east of Jervis Bay in south-eastern Australia. The peninsula forms the northern headland of Jervis Bay.
The Peninsula is divided between the State of New South Wales and the Australian Capital Territory.
The ACT section was transferred to the Commonwealth of Australia in 1915, as part of the Jervis Bay lands transferred by New South Wales to federal control to provide the national capital with access to the sea. While the bulk of this land was established as a separate Jervis Bay Territory when the Australian Capital Territory was granted self-government, the portion on the Beecroft Peninsula remains part of the ACT. The ACT portion of the peninsula consists of a strip of land around the southern edge of the peninsula, which is the northern headland of Jervis Bay. However, the Point Perpendicular lighthouse (and its grounds) at Point Perpendicular, which is the southern tip of the peninsula and at the northern entrance to Jervis Bay, remains an enclave of New South Wales territory within the ACT's enclave.
A large part of the peninsula (both NSW and ACT portions) is under the administration of the Royal Australian Navy for use as a live-firing range. For this reason, access to this part of the peninsula is restricted at certain times.
Due to strong winds and waves from the south the peninsula contains numerous caves and blowholes. Its varied fauna and vegetation have led to a request for the area to be made into a National Park. There is a town in the northeast of the peninsula called Currarong.