|Region||Lahad Datu, Kinabatangan, and Sandakan districts of Sabah|
The Ida'an (also Idahan) language is a Malayo-Polynesian language spoken by the Ida'an people of Sabah, Malaysia. The language has a long literary history, the first known writing in Idahan language was a manuscript dated 1408 A.D. The Jawi manuscript gives an account of an Ida'an man named Abdullah in Darvel Bay who embraced Islam and became one of the earliest known regions in Malaysia to embraced Islam.
Lobel (2016) lists Sungai Seguliud and Begak as Idaanic languages (language varieties closely related to Ida'an proper). The Begak dialect is threatened with extinction, as younger speakers are switching to Malay.