Giambattista della Porta (1535?– 4 February 1615), also known as Giovanni Battista Della Porta and John Baptist Porta, is an Italian scholar, polymath and playwright who lives in Naples at the time of the Scientific Revolution and Reformation.

Giambattista della Porta spends the majority of his life on scientific endeavors.

He benefiteds from an informal education of tutors and visits from renowned scholars.

His most famous work, first published in 1558, is entitled Magiae Naturalis (Natural Magic).

In this book he covers a variety of the subjects he has investigated, including the study of: occult philosophy, astrology, alchemy, mathematics, meteorology, and natural philosophy.

He is also referred to as "professor of secrets".