Sadri is a branch of Prakrit language and is regarded as a sister language of Oriya, Bengali and Maithili. It is spoken in the Indian states of Bihar Jharkhand, Orissa and the north of West Bengal, and in Bangladesh.

Speakers of Sadri also use Hindi, Oriya, and Bengali. Population includes 1,381,000 Sadani, 574,000 Nagpuri, and 165,683 Oraon (as of 1997). Also spoken by the Chero tribe as first language. Sadri has become a lingua franca of jharkhandi societies. Besides speaking their own mother tongue Oraon, Munda, Kharia communities speak in Sadri with each other in many part of jharkhand, Orissa, Chhattisgarh, North Bengal, Assam, Andaman and Nicobar and other part of India, where Jharkhandi community resides.There are many variation of Sadri. The resident of Biru region (former princely state) in Gumla district of Jharkhand speak it as their first language though they have their own language. Even Oraon, Munda and Kharia of Orissa speak it as their first language.Though, standardization of Sadri is still to be done, a lot of literature have been written in the language. Many Sadri magazien were published in Many parts of India.Gharaiya Guith a monthly Sadri monthly magazine is published from Shillong. Johar Sahiya is being published from Ranchi. Veer Birsa, Aguwa, Nawa Parha, Adivasi Express were published from Dooars and Tarai region of West Bengal. A few feature film have also been produced in Sadri language in Assam, Dooars, Jharkhand and in Orissa. Since 1980 a lot of Sadri songs and video film have been produced.A variation of Sadri is Nagpuri, which is being taught in Ranchi and other university of Jharkhand.Ranchi University Alternate names and/or names of dialects include: Sadani, Sadana, Sadati, Sadari, Sadhan, Sadna, Sadrik, Santri, Siddri, Sradri, Sadhari, Sadan, Nagpuria, Nagpuri, Chota Nagpuri, Dikku Kaji, Gawari, Ganwari, Goari, Gauuari, Jharkhandhi.