Herbert Ludwig Sandberg (26 February 1902 – 7 January 1966) was a Swedish conductor, librettist, and composer of German Polish descent.
Born in Breslau (now Wrocław), Sandberg was the son of Dr. Richard and Tranzlska (née Rosenthal) Sandberg. He was educated in Germany where he was a pupil of Julius Prüwer in Breslau and Leo Blech in Berlin. He later married Blech's daughter, Lisel Blech, on 19 August 1939. Sandberg began his career as a répétiteur at the Breslau Opera in 1919 when he was only 17 years old; a position he remained in through 1922. He then became the kapellmeister and assistant conductor to Blech at the Theater des Westens in Berlin (also known as the Berlin Volksoper) in 1923. This was followed by a post at the Deutsche Oper Berlin as assistant to Bruno Walter. He then became a conductor at the Royal Swedish Opera (RSO) in Stockholm in 1926 where he remained for the rest of his career. He notably conducted several world premieres at the RSO, including Lars-Erik Larsson's Prinsessan av Cypern (1937),Hilding Rosenberg's Lycksalighetens ö (1945), Natanael Berg's Genoveva (1947), and Ture Rangström's Gilgamesj (1952). In 1950 he conducted the world premiere of Birgit Cullberg's ballet Medea to music by Béla Bartók at the Rikstheatern Gaevle; a work he also conducted for its American premiere with the New York City Ballet at Lincoln Center in 1958. He also worked as a guest conductor on several occasions at the Bavarian State Opera, the Hamburg State Opera, and the Semperoper among other houses, and with the Nordwestdeutscher Rundfunk in Hamburg and the RIAS Symphony Orchestra in Berlin.