Theodoor Boeyermans, Theodor Boeyermans or Theodor Boeijermans was a Flemish painter active in Antwerp who painted Baroque history paintings and group portraits informed by the tradition of Peter Paul Rubens and Anthony van Dyck.

Theodoor Boeyermans was born in Antwerp as the son of Jan Boeyermans, Dirkszoon, originally from Haarlem who was a long-time resident of Antwerp and Agneta Leermans, a native of Antwerp. His mother was a widow who brought nine children from her first marriage into the family. The father of Boeyermans died in 1624. Boeyermans received his initial education in Antwerp. In 1634 his mother obtained a safe conduct allowing her family to stay in Eindhoven in the Dutch Republic. Here Boeyermans probably obtained a master's degree. He returned a few times to Antwerp to study and deal with several matters, including the receipt of his inheritance upon becoming an adult. From 1649 onwards he settled back in his native city where he lived in the house in which he was born and which was called 'De Gulden Pers' (The Golden Press).

It is not clear with whom he trained as a painter. Some historians have suggested a training in van Dyck's studio in Antwerp. He may also have made a trip to Italy. He became a master of the Antwerp guild of St. Luke in 1654 when he was already 34 years old.

He remained a bachelor his entire life. He joined the Sodaliteit der Bejaarde Jongmans, a fraternity for elderly bachelors established by the Jesuit order. He was also a member of the Antwerp chamber of rhetoric de Olyftack (Olive Branch) from 1664. He collaborated with Dirck van Delen, a Dutch member of 'de Olyftack', on a large painting entitled Allegory of the Arts which they donated to the chamber of rhetoric in 1666.

Marcus Forchondt, son of the art dealer Guillam Forchondt the Elder, was Boeyermans's pupil in 1670. Marcus later moved to Vienna to represent the family business but he remained in contact with Boeyermans as is testified by a letter dated September 1677.

Boeyermans died in Antwerp in January 1678.