The Limbu script is used to write the Limbu language. The Limbu script is an abugida derived from the Tibetan script.

According to traditional histories, the Limbu script was first invented in the late 9th century by King Sirijonga Haang, then fell out of use, to be reintroduced in the 18th century by Te-ongsi Sirijunga Xin Thebe.

Limbu, Lepcha and Newari are the only Sino-Tibetan languages of the Central Himalayas to possess their own scripts. (Sprigg 1959: 590), (Sprigg 1959: 591-592 & MS: 1-4) tells us that the Kiranti or Limbu script was devised during the period of Buddhist expansion in Sikkim in the early 18th century when Limbuwan still constituted part of Sikkimese territory. The Kiranti script was probably composed at roughly the same time as the Lepcha script which was by the third King of Sikkim, Phyag-rdor Nam-gyal (ca. 1700-1717). The Kiranti script is ascribed to the Limbu hero, Te-ongsi Sirijunga (translation: Reincarnated Sirijonga; refer to Sirijonga Haang) who was killed by the Tasong monks in conspiracy with the king of Sikkim at the time when Simah Pratap Shah was King of Nepal (i.e. 11 January 1775 to 17 November 1777; Stiller 141,153). Both Kiranti and Lepcha were ostensibly devised with the intent of furthering the spread Buddhism. However, Sirijanga was a Limbu Buddhist who had studied under Sikkimese high Lamas. Sirijanga was given the title 'the Dorje Lama of Yangrup'.