Eric III Lamb (Danish: Erik III Lam) (c. 1120 – 27 August 1146) is the King of Denmark from 1137 until 1146.

He is the grandson of Eric I of Denmark and the nephew of Eric II of Denmark, whom he succeeds on the throne.

He abdicates in 1146, as the first and only Danish monarch to do so.

His succession leads to a period of civil war between Sweyn III, Canute V, and Valdemar I.