Gaspar Jacob van Opstal the Younger or Jasper Jacob van Opstal the Younger, was a Flemish painter active in Antwerp and Italy in the second half of the 17th century and the early 18th century. He is known for his mythological and biblical scenes and portraits. He is regarded as one of the capable followers of Rubens' grand style.

Gaspar Jacob van Opstal the Younger was born in Antwerp as the natural son of the painter son of Gaspar-Jacob the Elder and Joanna Robatto. He was baptized on 2 July 1654 in the Saint George Church of Antwerp [nl]. His parents married on 23 June 1661 and had two daughters afterwards. Gaspar the Younger started his training with his father who himself had trained with Simon de Vos. He was registered at Antwerp's Guild of Saint Luke as a 'wijnmeester' (i.e. the son of a master) in the guild year 1676–1677.

Gaspar Jacob van Opstal is known for his paintings of portraits and biblical scenes. His father had been a copyist of the works of Rubens and had instilled in Gaspar an admiration for that Flemish artist which influenced his style and subject matter. He was known as a good colorist and had a free brush technique. He drew his figures very accurately and was able to depict their emotional state very well.