In Indian and Hindu mythology, Sesha is a naga (serpent). His massive form floats coiled in space, (alternative; on the universal ocean), to form the bed on which Vishnu lies. He is one of the primal beings of creation, and is closely associated with Vishnu.

Balarama, elder brother of Krishna, is sometimes said to be an incarnation of Sesha.

According to the Mahabharata (Adiparva), his father was Kasyapa and his mother Kadru .

Alternative spelling: Sesa.

Alternative names: Seshanaga (Sesha the serpent), Adisesha (the first Sesha), Anantasesha (Endless Sesha), Ananta (endless).