Paul Kalas (born August 13, 1967) is a Greek American astronomer known for his discoveries of debris disks around stars.

Kalas led a team of scientists to obtain the first visible-light images of an extrasolar planet with orbital motion around the star Fomalhaut, at a distance of 25 light years from Earth.

[1] [2] The planet is referred to as Fomalhaut b. Kalas was born in New York City to George Kavallinis and Maria Drettakis, who immigrated to the United States from Heraklion, Crete.

[4] He was the lead scientist for the first optical images of debris disks surrounding the nearby red dwarf AU Microscopii and the bright star Fomalhaut.

These features are considered strong evidence for an extrasolar planet orbiting Fomalhaut that gravitationally sculpts the morphology of the belt.