The job title of C.L.E. Moore instructor is given by the Math Department at Massachusetts Institute of Technology to recent math Ph.D.s hired for their promise in pure mathematics research. The instructors are expected to do both teaching and research. One of the most well known C.L.E. Moore instructors was John Nash in 1951. It is considered a very desirable and prestigious position.
The instructorships are named after Clarence Lemuel Elisha Moore (1876–1931), who was a mathematics professor at MIT from 1904 until his death, specializing in geometry.