Thomas Quellinus (March 1661 – September 1709), also known, especially in Denmark, as Thomas Qvellinus, was a Flemish baroque sculptor.
He was born in Antwerp but worked mainly in Copenhagen, Denmark.
He is especially known for the production of grandiose and sumptuous memorial chapels, sepulchral monuments and epitaphs, which can be found in churches throughout Denmark and northern Germany's Schleswig-Holstein area.
His chapels and monuments are dramatically composed, executed in rare, differently coloured types of marble and framed by monumental architectural components.
He was a member of the well-known Quellinus family of artists from 17th century Antwerp, major center of artistic life then known as "the Florence of the North".