Ernst Wülcker (24 August 1843, in Frankfurt am Main – 16 September 1895, in Weimar) was a German archivist and lexicographer. He was an older brother of philologist Richard Paul Wülker (1845–1910). He studied classical philology and Germanistics at the universities of Göttingen and Leipzig, and in 1870 was named secretary at the Frankfurt city archives. In 1875, he relocated to Weimar as first secretary of the private and city archives. In 1888 he was promoted to the archival council in Weimar.