Benedikt Hacker (* May 30, 1769 in Metten; † September 2, 1829 in Salzburg) was an Austrian composer and music publisher. Hacker arrived in Salzburg in 1783 where he became a pupil of Michael Haydn. From 1786 he worked as a bookseller in Salzburg. In 1803 he opened his own music publishing house where he published numerous works by Michael Haydn, among others. He composed German masses, cantatas, songs and male choruses. He published the first series of Salzburg postcards which were the precursors of postcards. He committed suicide in the Salzach River in 1829 after the financial collapse of his publishing company.