The native dialect of Kullu is 'Kulluvi'. It is further divided into 3 sub-dialects, which are Outer Seraji, Inner Seraji and Sainji.

Outer Seraji: This dialect is widely spoken in the region between South of Jallori Pass and Korpan Valley.
Inner Seraji: From the North of Jallori Pass which extends to Aut - at a distance of 28 km from Kullu, the dialect is widely spoken.
Sainji: In the Sainj Valley, which is at a distance of 35 km from Kullu, Sainji is widely spoken.

Usage and pronunciation of certain words of Kulluvi dialect vary from valley to valley within Kullu district.

Dr. Greyson of 'Linguistic Survey of India' considers the dialect of Kullu as the basis of the dialects of Mandi, Kangra and Chamba districts. Kulluvi has a rich tradition of folk literature rooted in the ancient (Puranic) tradition of the Aryans. During the period of feudal states, Kullu literature was written in Tankri script. Tankri became famous in 17th century. During ancient times, Tankri was the script of the Royal Courts. All the official documents were written in Tankri script, but as the Royal Courts vanished, this script also started disappearing. Tankri originated from Sharda script (one of the ancient script used in Kashmir region). Even before that Devanagari script (the source script for Hindi language) was in vogue.

The dialect spoken in Village Malana , which is believed to be one of the oldest existing republic, is called Kanashi, but signs of Kirta language are also found here. Kirta language is closely connected to the Indo-Aryan family of languages.