Matthijs Siegenbeek (Dutch pronunciation: [mɑˈtɛis ˈsiɣə(m)ˌbeːk]; 23 June 1774 in Amsterdam – 26 November 1854 in Leiden) was a Dutch academic. From 1797 to 1847 he was the first professor of the Dutch language at the University of Leiden. From 1803 he was the member, then secretary, of the head-office of that university's literary faculty. Initially he was a Mennonite voorganger in Dokkum.