Hans Jakob Dünz was a Swiss Stained-glass painter, illustrator and choir librettist.

Hans Jakob Dünz was born as the fourth of six children of Hans Lienhard I Dünz and Barbel Grülich. His father died when the boy was about five years old. He probably completed his apprenticeship as an artisan in Brugg. First probably with his uncle Jakob Brunner (1546-1589) and after his death with Simon Schilpli († 1633/34);

On his travels, he apparently went to Basel and Zurich, among other places, and then probably joined Hans Jakob Plepp's workshop in Bern as a journeyman. From 1597 onwards, there is evidence of window cracks signed with his master's mark and created in Bern. In his first creative phase until 1609, he was mainly active as a carver and at the same time as a glass painter. His designs were frequently acquired by other masters. In 1599 he was accepted as a tenant in Bern and entered into a first marriage with Johanna Metzler, with whom he had 14 children. In 1609, he became a Bernese burgher and his graphic design and stained glass work for private clients faded into the background. He now received commissions from the authorities, flat painting work and a group of stained glass windows.

In 1621, he was elected choir reverend. He presumably gave up the stained glass workshop. There are hardly any works by him from 1609-1621.

Around 1621, he began his hidden late work as a draughtsman. In the so-called Lochrödel, the journal that he kept as Weibel and prisoner guard of the Bernese choir court, he began to develop the means of modern satire, from physiognomic caricature to type caricature and cartoons. After his first wife died, he married Margreth Seebach in 1629, with whom he had three children.

He was the father of Hans Jakob ll Dünz and grandfather of Johannes Dünz.