Anton Weidinger (June 9, 1766 in Vienna – September 20, 1852 in Vienna) was an Austrian trumpet virtuoso in the classical era, and a "k. k. Hof-Trompeter" (Imperial and Royal Court trumpeter). He was friends with Haydn, Mozart, Beethoven and Hummel. Basing his ideas on earlier designs, in 1792, Weidinger experimented with a 7-keyed trumpet, a version of the instrument on which a full chromatic scale became possible, albeit with alleged loss of the instrument's usual power. It remained fashionable until well into the 19th century, when it was superseded by the valve trumpet.