Adalbero III of Luxembourg (c. 1010 – 13 November 1072) was a German nobleman. He was a titular Count of Luxembourg and Bishop of Metz. Adalbero was the third son of Count Frederick of Luxembourg and a brother of Count Giselbert. In 1047, he succeeded his uncle (d. 30 April 1047) as Bishop of Metz. He distinguished himself by his piety, his education, the prudent manner in which he administered his bishopric and his political influence. Adalbero III was also present at the council in Rome in 1050 where Bishop Gerard of Toul was canonized.