Gustav Walter (11 February 1834, Bílina, Bohemia – 31 January 1910, Vienna) was a German (from Bohemia) operatic lyric tenor who sang leading roles for more than 30 years at the Vienna Staatsoper in Austria. He was a highly regarded interpreter of the vocal music of Wolfgang Amadeus Mozart and the lighter tenor roles composed by Richard Wagner. Walther also created the role of Assad in the world premiere of Karl Goldmark's Die Königin von Saba and performed in some Italian and French operas.
After retiring from the stage in 1887, Walter toured Europe as a lauded recitalist of lieder, premiering numerous songs by Johannes Brahms and Antonín Dvořák. He became a celebrated pedagogue, teaching voice at the Vienna Conservatory for more than two decades. Notably, too, he is one of the very earliest singers to have left a legacy of gramophone recordings.