Cornelis Pietersz. Hooft was a Dutch statesman. He was the grandson of Pieter Willemsz. Hooft, a Zaanse grain merchant and shipmaster, and the father of the poet and dramatist Pieter Corneliszoon Hooft. Hooft himself held numerous positions in the administration of Amsterdam. He was amongst others, schepen, twelve times mayor, and treasurer in a period of fast growth, so that the city had to be expanded three times.
Cornelis' father established himself in Amsterdam. In 1569 he went into exile, but in 1574 came back from Königsberg and established himself in Hoorn. Then, in 1578, after the Alteratie on 26 May, he risked going back to Amsterdam. He lived on Nieuwendijk on the IJ. Hooft had been interested in theology, but was nevertheless tolerant - his wife Anna Jansdr Blaeu was a Mennonite, and he seems to have been a 'via media' man, declaring for neither the Remonstrants nor the Anti-Remonstrants.
As an independent merchant he had a large share in Baltic trade and reshipped herring, oil and grain. In 1584 he became a member of the vroedschap, in which he remained until its final session. In 1588 he was chosen as mayor.