Dominicus Claessens (c. 1635 – c. 1690) was a Flemish still life painter and engraver.^[1]

Very little is known about Claessens' life. He was likely born in Antwerp around 1631 as on 4 July 1674 he declared (as a witness) to be 'ontrent 43 jaeren' (around 42 years old).^[1] He became a master in the Guild of Saint Luke of Antwerp in 1660–1661.^[2]

He was active as a still life painter and reproductive printmaker. He made engravings for David Teniers the Younger's Theatrum pictorium, a catalog of 243 Italian paintings in the Archduke Leopold Wilhelm of Austria's collection of over 1300 paintings kept at his residence in Brussels. One of these engravings depicting a Virgin and Child accompanied by St John and an Angel after a painting by Giulio Cesare Procaccini was included by Joseph Strutt in his 1786 dictionary of engravers. Strutt was critical about Claessens' inaccurate execution of the print.^[3]

Guild membership granted him the right to sign and date his paintings. A Still life of fruit and musical instruments on a draped table is signed and dated 1665.^[4]