Artus Quellinus III (1653, Antwerp – December 1686, London) was a Flemish sculptor active in London. His name is often anglicised to Arnold Quellan, Arnold Quellin or Arnold Quellinus or mistakenly given as Jan Quellinus.
He was the son of Artus Quellinus II and brother to the sculptor Thomas Quellinus and the painter Cornelis Quellinus He trained in his father's workshop in Antwerp before moving to London in 1682. He was married to Frances Siberechts, youngest daughter of the Antwerp-born painter Jan Siberechts, who had decided to emigrate to London to join the already-sizeable colony of Flemish artists there. It was probably Siberechts who convinced Quellinus III and his wife to also move there.
There is evidence that he was working in the studio of Hugh May in 1679, before moving to that of the Flemish carver and sculptor Grinling Gibbons in 1680, joining fellow Flemings Antoon Verhuke, John Nost, Peter Van Dievoet and Laurent Van Der Meulen Quellinus III and Gibbons collaborated on the altarpiece for the Roman Catholic chapel in Whitehall Palace (1685–86). After his early death, his widow married his studio assistant John Nost.