Eaglenest or Eagle's Nest Wildlife Sanctuary is a protected area of India in the Himalayan foothills of West Kameng District, Arunachal Pradesh.

[4][5] Eaglenest Wildlife Sanctuary is part of the Kameng protected area complex (KPAC), the largest contiguous closed-canopy forest tract of Arunachal Pradesh, which includes Eaglenest, Pakke, Sessa, Nameri, and Sonai Rupai sanctuaries and associated reserved forest blocks.

[3] It is home to at least 454 species of birds including 3 cormorants, 5 herons, black stork, Oriental white (black-headed) ibis, 4 ducks, 20 hawks, eagles, kites, harriers and vultures, 3 falcons, 10 pheasants, junglefowl, quail, and peafowl, black-necked crane, 3 rails, 6 plovers, dotterels, and lapwings, 7 waders, ibisbill, Indian Thick-knee, small pratincole, 2 gulls, 14 pigeons, 3 parrots, 15 cuckoos, 10 owls, 2 nightjars, 4 swifts, 2 trogons, 7 kingfishers, 2 bee-eaters, 2 rollers, hoopoes, 4 hornbills, 6 barbets, 14 woodpeckers, 2 broadbills, 2 pittas, 2 larks, 6 martins, 7 wagtails, 9 shrikes, 9 bulbuls, 4 fairy-bluebirds, 3 shrike, brown dipper, 3 accentors, 46 thrushes, 65 Old World flycatchers, 6 parrotbills, 31 warblers, 25 flycatchers, 10 tits, 5 nuthatches, 3 treecreepers, 5 flowerpeckers, 8 sunbirds, Indian white-eye, 3 bunting, 14 finches, 2 munia, 3 sparrows, 5 starlings, 2 orioles, 7 drongos, ashy woodswallow and 9 jays.

[11] Other mammal species include the endangered capped langur, red panda, Asiatic black bear and the vulnerable Arunachal macaque and gaur.

It was here that a new taxon of primate was discovered in 1997 by noted primatologist of northeast India Dr Anwaruddin Choudhury,[12] but he thought it to be a new subspecies of Tibetan or Pere David's macaque.

[15] Eaglenest Wildlife Sanctuary is home to at least 165 species of butterflies including Bhutan glory, grey admiral, scarce red-forester, dusky labyrinth, tigerbrown, jungle-queen sp, white-edged bushbrown, and white owl.

[17] Eaglenest Wildlife Sanctuary is physically protected from timber and animal poaching only by its isolation and the poor quality of the one lane road leading inside it.

The Critical Ecosystem Partnership Fund (CEPF), a consortium of major international and regional organizations, has identified the Eastern Himalayan region around Arunachal Pradesh (Nepal, Bhutan and all of Northeast India) as a critical global biodiversity rich area deserving of conservation focus.