1594 in science

Botany

• Tulip bulbs planted by Carolus Clusius in the Hortus Botanicus Leiden, Holland, first flower.

Exploration

• First voyage of Willem Barents in the Arctic Ocean in search of the North-east passage.
• John Davis publishes a treatise on navigation, The Seamans Secrets, and invents a version of the backstaff.
• Robert Hues publishes a practical treatise on the use of terrestrial and celestial globes in navigation, Tractatus de globis et eorum usu.

Medicine

• Anatomical theatre completed at the University of Padua.

Technology

• Bevis Bulmer sets up a system at Blackfriars, London, for pumping a public water supply.

Publications

• Johannes Huser of Waldkirch completes the publication of Paracelsus's works.
• Baldo Angelo Abati : Opus discussarum concertationum praeclarum, de rebus, verbis, et sententiis controversis, ex omnibus fere scriptoribus, libri XV published at Pesaro.

Deaths

• June 7 – Rodrigo Lopez, physician to Elizabeth I of England.
• Cristóbal Acosta, physician.