Barthold Kuijken (Dutch pronunciation: [ˈbɑrtɔlt ˈkœykə(n)]; born 8 March 1949, Dilbeek) is a Belgian flautist and recorder player, known for playing baroque music on authentic instruments and particularly known for pioneering this manner of performance with his brothers, cellist and viol player Wieland Kuijken and violinist Sigiswald Kuijken and the harpsichordist Gustav Leonhardt. He teaches baroque flute at the Royal Conservatories of Brussels and The Hague.