Giulio Cesare la Galla (or Julius Cæsar Lagalla or Giulio Cesare Lagalla) (1571–1624) was a professor of philosophy at the Collegio Romano in Italy.
He became the official physician of the papal galleys for a period, then came to Rome to lecture in natural philosophy at the Collegio Romano.
He apparently became the leading peripatetic of the city, and was counted among the opponents of the Copernican heliocentric theory.
But he did debate Galileo's three-dimensional representation of the Moon based on two-dimensional visual observations.
In his book De Phenomenis in Orbe Lunae (published in Venice in 1612) he claimed that the untreated stone (known as "lapis solaris" and shown to him by Galileo Galilei) was unable to give off light only after calcination.