The Imperial Order of the Lion and the Sun (Persian: نشان سلطنتی شیر و خورشید) was instituted by Fat’h Ali Shah of the Qajar dynasty in 1808 to honour foreign officials (later extended to Iranians) who had rendered distinguished services to Iran.

In 1925, under the Pahlavi dynasty the Order continued as the Order of Homayoun with new insignia, though based on the Lion and Sun motif.

This motif was used for centuries by the rulers of Iran, being formally adopted under Mohammad Shah.

The order is abbreviated as KLS, for Knight of Lion and Sun.

It was issued in five grades.