Maryul (Ladakhi: མར་ཡུལ།), also called mar-yul of mnga'-ris, was the western-most Tibetan kingdom based in modern-day Ladakh and some parts of Tibet. The kingdom had its capital at Shey.

The kingdom was founded by Lhachen Palgyigon, during the rule of his father Kyide Nyimagon, in c. 930. It stretched from the Zoji La at the border of Kashmir to Demchok in the southeast, and included Rudok and other areas presently in Tibet. The kingdom came under the control of the Namgyal dynasty in 1460, eventually acquiring the name "Ladakh", and lasted until 1842. In that year, the Dogra general Zorawar Singh, having conquered it, made it part of the would-be princely state of Jammu and Kashmir.

Mar-yul has been interpreted in Tibetan sources as lowland (of Ngari),. Scholars suspect that it was a proper name that was in use earlier, even before Ladakh was Tibetanised. For instance, the Chinese Buddhist pilgrim Xuanzang referred to it as Mo-lo-so, which would lead to a reconstructed name such as *Malasa, *Marāsa, or *Mrāsa. The Annals of Tun‐Huang state that the Tibetan government carried out a census of Zan-zun and Mar(d) in 719 CE. The Persian text Hudud al-Alam (c. 982) refers to a "wealthy country of Tibet", with a tribe named Mayul. These facts suggest that Mar-yul ("land of Mar") might have been a proper name of the country.

The name was in use at least until the 16th century. Mirza Haidar Dughlat referred to it as Maryul and named a region called "Ladaks" that was apparently distinct from Maryul. It was also used by the Portuguese Jesuit missionary Francisco de Azevedo when he visited Ladakh in 1631, but his usage of the name has been described by Luciano Petech as referring to neither the Kingdom of Ladakh nor Rudok.

The newer name La-dwags ལ་དྭགས (historically transliterated as La-dvags) means "land of high passes". Ladak is its pronunciation in several Tibetan districts, and Ladakh is a transliteration of the Persian spelling.

Upon the assassination of emperor Langdarma in c. 842, the Tibetan empire became fragmented over a succession dispute that would linger for centuries. By the late ninth century, one of his grandsons, Depal Khortsen, was controlling most of Central Tibet. Upon his assassination, one of his sons, Kyide Nyimagon (Wylie: sKyid-lde Nyi-ma-mgon), made it to West Tibet — the causes are disputed.^{[original research?]}

Nyimagon entered into a marital alliance with a high-nobility of Purang and established his kingdom, stretching from the Mayum La in the east to the Zoji La in the west. Upon his death c. 930, his vast kingdom was divided among his three sons: the eldest son, Lhachen Palgyigon, receiving Maryul, the second son, Trashigon, receiving Guge and Purang, and the third son, Detsukgon, receiving Zanskar (mountainous area between Ladakh and Kashmir).

Thus, the Kingdom of Maryul was founded by Lhachen Palgyigon (dPal-gyi-mgon) when he was still a prince.