The Limbu alphabet, or Kirat-Sirijonga script, is a Brahmic script used to write the Limbu language of northern India and Nepal.

According to traditional histories, it was first invented in the late 9th century by the king Sirijonga Hang, then fell out of use, to be reintroduced in the 18th century by Te-ongsi Sirijonga (1704-1741?). This Sirijonga, who was believed to be the reincarnation of the first, was apparently martyred in 1741 (or 1743) for the sake of this script by the Sikkim Lamas, who tied him to a tree and flung poison arrows at him. The script was named 'Sirijonga' in his honour by the Limbu scholar Iman Singh Chemjong in 1925.

Unlike most other Brahmic scripts, it does not have separate independent vowel characters, instead using a vowel carrier letter with the appropriate dependent vowel attached.

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