Karl Ludwig Harding (September 29 1765 – August 31 1834) was a German astronomer, notable for having discovered the asteroid 3 Juno.

He was hired in 1796 by Johann Hieronymus Schröter as a tutor for the latter's son, and discovered Juno at Schröter's observatory. He then went to Göttingen to assist Carl Friedrich Gauss.

In addition to Juno, he discovered three comets and published the Atlas novus coelestis which catalogued 120,000 stars.

A crater on the Moon is named after him, and so is the asteroid 2003 Harding .