Ahom or Tai Ahom (Ahom: 𑜁𑜪𑜨 𑜄𑜩 𑜒𑜑𑜪𑜨 or 𑜁𑜨𑜉𑜫 𑜄𑜩 𑜒𑜑𑜪𑜨; khwám tái ahüm) is a dormant, Southwestern Tai language formerly spoken by the Ahom people. It's currently undergoing a revival and mainly used in religious and educational purposes. Ahom language was the state language of Ahom kingdom. It was relatively free of both Mon-Khmer and Indo-Aryan influences and has a written tradition dating back to the 13th century.^{[citation needed]}

The Ahom people established the Ahom kingdom and ruled parts of the Brahmaputra river valley in the present day Indian state of Assam between the 13th and the 18th centuries. The language was the court language of the kingdom, until it began to be replaced by the Assamese language in the 17th century. Since the early 18th century, there have been no native speakers of the language, though extensive manuscripts in the language still exist today. The tonal system of the language is entirely lost. The language was only partially known by a small group of traditional priests of the Ahom religion, and it was being used only for ceremonial or ritualistic purposes.

There has been efforts to revive the language in recent times. A reconstructed version is taught in various educational institutions in Assam by AHSEC and Dibrugarh University.

Tai Ahom is classified in a Northwestern subgrouping of Southwestern Tai owing to close affinities with Shan, Khamti and, more distantly, Thai. The immediate parent language from which Ahom is descended has been reconstructed as Proto-Tai, a language from 2000 years ago, in the Kra–Dai family (unrelated to Chinese, but possibly related to the Austronesian languages), within the (proposed but debated) subgroup of Kam–Tai, although some say that Tai languages are a discrete family, and are not part of Kra–Dai. Ahom is distinct from but closely related to Aiton, which is still spoken in Assam to this day.

Ahom has characteristics typical of Tai languages, such as:

When speaking and writing Ahom, much is dependent upon context and the audience interpretation. Multiple parts of the sentence can be left out; verb and adjectives will remain, but other parts of speech, especially pronouns, can be dropped. Verbs do not have tenses, and nouns do not have plurals. Time periods can be identified by adverbs, strings of verbs, or auxiliaries placed before the verb. Ahom, like other Tai languages, uses classifiers to identify categories, and repetitions of words to express idiomatic expressions. However, the expressions, classifiers, pronouns, and other sentence particles vary between the Tai languages descended from Proto-Tai, making Tai languages mutually unintelligible.

It has its own script, the Ahom script.

The Ahom people and their language originated in Yunnan in south-west China. They migrated from the border between northern Vietnam and the Guangxi province of China, to the Hukawng Valley, along the upper reaches of the Chindwin river, northern Burma. In the 13th century, they crossed the Patkai Range. and settled in the Brahmaputra River valley, in Northeast India. After increasing their power in Upper Assam, the Ahom people extended their power to the south of the river Brahmaputra and east of the river Dikho, which corresponds to the modern day districts of Dibrugarh and Sibsagar, Assam, where the Ahom still reside today. Tai Ahom was the exclusive court language of the Ahom kingdom, where it was used to write state-histories or 'Buranjis'.