Nuño González III de Lara (died 1296) was a Castilian noble of the House of Lara. He was the lord consort of Alegrete, Vide, and Sintra and served as Alférez del rey for King Ferdinand IV of Castile.
He was the son of Juan Núñez I de Lara the Fat, head of the House of Lara, and his wife, Teresa Díaz II de Haro, Lady of Biscay. His paternal grandparents were Nuño González de Lara el Bueno, Head of the House of Lara, and his wife, Teresa Alfonso. His maternal grandparents were Diego López III de Haro, Lord of Biscay and his wife, Constanza de Bearne. He was the great-great-grandson of Alfonso IX of León on both his mother's side and his father's side.
He was the brother of Juan Núñez II de Lara, head of the House of Lara, of Teresa Núñez de Lara y Haro, and of Juana Núñez de Lara, who married Ferdinand de la Cerda, Lord of Lara (1275–1322), son of the infante Ferdinand de la Cerda and grandson of Alfonso X of Castile.
His exact date of birth is unknown. On 29 October 1288, he was confirmed together with his father and brother to the privileges granted by Sancho IV of Castile to the monastery of San Salvador de Pinilla de Molina. In August 1290, he accompanied his father to Valencia where he was working. His father signed an agreement during this period with King Alfonso III of Aragon wherein the two proposed to wage war against the Kingdom of Castile and to aid the Aragonese monarch in his war against Castile. Nevertheless, later in the same year, he returned with his father to Castile where King Sancho IV gave Nuño González a set of inheritances throughout the kingdom in exchange for an oath of loyalty from the young Lara.