Derrycunnihy Wood is a national nature reserve of approximately 336 acres (1.36 km2) located in County Kerry, Ireland.

[3] The reserve is located in Killarney National Park.

It is believed to be one of the oldest and most natural native sessile oak woods in Ireland[4][5] and the country's best example of a damp-climate oceanic wood with dense mosses and ferns.

The reserve also contains lake shore and areas of bog.

Two species of deer graze in the reserve, native red deer graze in winter on the open hills, and the Japanese sika deer which were introduced in the 18th century graze the woodland all year round, which results in areas of grass like lawn and a brown line under which all leaves and twigs have been eaten.