Chittagonian ( or ) or Chittagonian Bengali is an Indo-Aryan language spoken in parts of the Greater Chittagong in Bangladesh. Chittagonian is not inherently intelligible to other varieties of Bengali, although it is considered by some as a nonstandard Bengali dialect. Chittagonian is also considered to be a separate language by some linguists. While Chittagonian is linguistically distinct, its speakers identify with Bengali culture and the Standard Bengali language. It is broadly mutually intelligible with the Rohingya language and with a lesser extent to Noakhali. It is estimated (2006) that Chittagonian has 13 million speakers, principally in Bangladesh.
Chittagonian is a member of the Bengali-Assamese sub-branch of the Eastern group of Indo-Aryan languages, a branch of the wider Indo-European language family. It is derived through an Eastern Middle Indo-Aryan from Old Indo-Aryan, and ultimately from Proto-Indo-European. grouped the dialects of Chittagong under Southeastern Bengali, alongside the dialects of Noakhali and Akyab. places Chittagonian in the eastern Vangiya group of Magadhi Prakrit and notes that all Bengali dialects were independent of each other and did not emanate from the literary Bengali called "sadhu bhasha". Among the different dialect groups of these eastern dialects, Chittagonian has phonetic and morphological properties that are not present in standard Bengali and other western dialects of Bengali.
The Bengali script (Bangla Lipi) and Latin script are used to write this language.
Gboard for Android has added a Chittagongian Keyboard.
The following text is Article 1 of the Universal Declaration of Human Rights, written in Chittagonian:<br>
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Biyak manuà  ijjôt edde ókôr ÃÂà Âabe ajad ar úyainnaa óiyere fôyda óy. ÃÂtarattu ahôl edde bibek ase; etôllay ejjôn arejjônôr úyare bhaiyur nan bebhar gôrôn dôrhar. <br>
All human beings are born free and equal in dignity and rights. They are endowed with reason and conscience and should act towards one another in a spirit of brotherhood.