Hieronymus Cock, or Hieronymus Wellens de Cock (1518 – 3 October 1570) was a Flemish painter and etcher as well as a publisher and distributor of prints. Cock is regarded as one of the most important print publishers of his time in northern Europe. His publishing house played a key role in the transformation of printmaking from an activity of individual artists and craftsmen into an industry based on division of labour. His house published more than 1,100 prints between 1548 and his death in 1570, a vast number by earlier standards.