Ol Onal script is used to write the Bhumij language in some parts of West Bengal, Jharkhand, Orissa, and Assam.

[5] The language is closely related to Mundari (mutually intelligible with it but with many dialectal differences), Ho, and Santali.

Later researchers started to use Devanagari, Bengali, and Odia scripts to document the Bhumij language.

The Ol Onal script was created in between 1981 and 1992 by Mahendra Nath Sardar for writing Bhumij in India.

Ol Onal is written from left to right and behaves as a regular alphabet, and not like the typical abugidas used for other Indic scripts: the 6 basic vowels and 24 basic consonants are simply written as standalone letters, and the consonants do not have any inherent vowel.