The King of Nepal (traditionally known as the Mahārājdhirāja i.e. Great King of Kings; it can also be translated as "Sovereign Emperor" was Nepal's head of state and monarch from 1768 to 2008. He served as the head of the Nepalese monarchy—Shah Dynasty. The monarchy was abolished on 28 May 2008 by the 1st Constituent Assembly. The subnational monarchies in Mustang, Bajhang, Salyan, and Jajarkot were abolished in October of the same year.

The Kingdom of Nepal was a Hindu kingdom in South Asia, formed in 1768 by the expansion of the Gorkha Kingdom, which lasted until 2008 when the kingdom became the Federal Democratic Republic of Nepal. It was also known as the Gorkha Empire, or sometimes Asal Hindustan. Founded by King Prithvi Narayan Shah, a Gorkha monarch who claimed to be of Khas Thakuri origin, it existed for 240 years until the abolition of the Nepalese monarchy in 2008. During this period, Nepal was formally under the rule of the Shah dynasty, which exercised varying degrees of power during the kingdom's existence.