大冠鹫（学名：Spilornis cheela）又名蛇雕、蛇鹰、冠蛇雕，是一种中型猛禽，属于鹰科一员。

大冠鹫分布很广，从亚洲南部的印度和斯里兰卡到亚洲东南部的中国南方及印度尼西亚，筑巢在森林近水边的树冠，鸟巢以树枝条构成，且一巢只生一个蛋。

大冠鹫高约55至75公分，成鸟背面和后颈为黑褐色，胸部和腹部和翼下为淡褐色，胸腹有白色斑点，停栖时可见明显冠羽，在高空时翼开展保持以浅Ｖ字体翱翔，尾巴和翼下后缘为黑色有一条白色横带。

大冠鹫鸣叫声是「呼、呼、悠悠阿」，声音高昂，远处可听闻，尤其是在早上过后，靠着热气流盘旋飞上高空时。

The crested serpent eagle (Spilornis cheela) is a medium-sized bird of prey that is found in forested habitats across tropical Asia. Within its widespread range across the Indian Subcontinent, Southeast Asia and East Asia, there are considerable variations and some authorities prefer to treat several of its subspecies as completely separate species. In the past, several species including the Philippine serpent eagle (S. holospila), Andaman serpent eagle (S. elgini) and South Nicobar serpent eagle (S. klossi) were treated as subspecies of the Crested serpent eagle. All members within the species complex have a large looking head with long feathers on the back of the head giving them a maned and crested appearance. The face is bare and yellow joining up with the ceres while the powerful feet are unfeathered and heavily scaled. They fly over the forest canopy on broad wings and tail have wide white and black bars. They call often with a loud, piercing and familiar three or two-note call. They often feed on snakes, giving them their name and are placed along with the Circaetus snake-eagles in the subfamily Circaetinae.