South East Forest National Park, Nature reserve in New South Wales, Australia.

South East Forest National Park covers 115,177 hectares between the Monaro and South Coast regions, 378 km southwest of Sydney. Wet sclerophyll eucalypt forest covers 42% of the park, with temperate rainforest in sheltered areas and subalpine bogs at high elevations. It adjoins Coopracambra National Park in Victoria across the Black-Allan Line.

Until 1968 the area was vacant crown land known as the Wallagaraugh Wilderness, where a state committee proposed protecting about 100,000 hectares. The Japanese company Harris-Daishowa instead obtained state forest for woodchips, and logging ran from October 1969 for 25 years. Nalbaugh and Nungatta national parks were declared in 1972 and 1973; Genoa, Tantawangalo, Bemboka, Yowaka and Coolangubra followed in 1994, and their 1997 merger created this park.

The park's legal name is "South East Forest National Park", as set in the Act of the New South Wales Parliament that created it; official signage, however, uses the plural "Forests", the form most people say. The park lies between the Monaro and South Coast regions, and its old-growth eucalypt stands are the reason it was fought over for a quarter of a century.

The park lies 378 km southwest of Sydney, between the Monaro and South Coast regions, and adjoins Coopracambra National Park in Victoria across the Black-Allan Line. Access is by road from Bombala in New South Wales or Cann River in Victoria. Much of the terrain is rugged forest, so plan walks around the wet sclerophyll and rainforest sections rather than expecting marked routes throughout.

The park's legal name is "South East Forest National Park", singular, as set in the New South Wales act that created it; official signage, however, uses the plural "Forests". Combined with Coopracambra National Park across the Black-Allan Line in Victoria, it forms one of the largest contiguous wilderness areas in south-eastern Australia, running from Bombala to Cann River.