Robert Fludd also known as Robertus de Fluctibus (1574 Bearsted, Kent - September 8 1637, London) was a prominent Rosicrucian and Paracelsian. He was the son of Sir Thomas Fludd a high-ranking governmental official.

Between 1598 and 1604 Fludd studied medicine, chemistry and the occult on the European mainland, but he is best known for his research in occult philosophy. He had a celebrated exchange of views with Johannes Kepler concerning the scientific and hermetic approaches to knowledge.