Ríg is the name applied to a Norse god described as "old and wise, mighty and strong" in the Eddic poem Rígthula (Old Norse Rígþula - Song of Ríg).

Ríg wandered through the world and brought into being (apparently by fathering them) the progenitors of the three classes of human beings as conceived by the poet. The youngest of these sons inherited the name "Ríg" and his youngest son, Kon the Young or Kon ung (konung meaning 'king' in Old Norse) also inherited the name or title "Ríg". This third Ríg was the first true king and the ultimate founder of the state of royalty as appears in the Rígsthula and in two other works in connection. In all three sources he is connected with two primordial Danish rulers named Dan and Danp.

The poem Rígthula is preserved incomplete on the last surviving sheet in Codex Wormianus following Snorri Sturluson's Edda. A short prose introduction explains that the god in question was Heimdall who wandered along the seashore until he came to a farm where he called himself Ríg. The name Ríg appears to be the oblique case of Old Irish rí, ríg "king", cognate to rex in Latin and rajan in Sanskrit.