Karl Ludwig Harding (29 September 1765 – 31 August 1834) was a German astronomer, who discovered Juno, the third asteroid of the main-belt in 1804.

Schröter was an enthusiastic astronomer and owner of a well-equipped observatory in Lilienthal near Bremen, where Harding was soon appointed observer and inspector.

In 1800, he was among the 24 astronomers invited to participate in the celestial police, a group dedicated to finding additional planets in the solar system.

As part of the group, in 1804, Harding discovered Juno at Schröter's observatory.

He worked at Göttingen Observatory, since 1807 as colleague of Carl Friedrich Gauss, until his sudden death in 1834.