|Native to||Nepal, India|
|Ethnicity||Tharu (incl. Bhoksa)|
|Native speakers||1.7 million (2001–2007)|
|Official language in||Tharuban of Nepal|
thl – Dangaura Tharu
tkt – Kathoriya Tharu
thr – Rana Tharu
the – Chitwania Tharu
thq – Kochila Tharu
tkb – Buksa Tharu
soi – Sonha
The Tharu (Nepali: थारु) or Tharuhati (Nepali: थरुहटी) languages are spoken by the Tharu people of the Inner and Outer Terai of Nepal, and of neighboring parts of the states of Uttarakhand, Uttar Pradesh and Bihar in India.
The Tharu have lived long enough in lands rendered marshy and intensely malarial by rivers and groundwater percolating out of the Siwalik foothills to have evolved resistance enough to live where most ethnic groups could not before the arrival of quinine and DDT. Thus the Tharu may already have been in place before the first Indo-Aryan incursions more than three thousand years ago, or even before the population of the higher hills to the north by Tibeto-Burman peoples. Nevertheless the surviving Tharu dialects are strictly Indo-Aryan languages without known remnants of anything more ancient.
Dialects spoken west of the Gandaki River are called Dangaura (Chaudary), Kathoriya, Rana, and Buksa are mutually intelligible apart from their geographic extremes, and are spoken by about 1.3 million. Sonha is largely mutually intelligible with Dangauru.
Just east of the Gandaki Chitwania (Nawalparasi) has a quarter million speakers in and around Chitwan Valley. In eastern Nepal Kochila is also spoken by a quarter million. Kochila is dialectically diverse, but the dialects are only recorded according to the name of the local district. Many ethnic Kochila have adopted Maithili.
On the ground, it becomes more difficult to say exactly what a given person speaks. Tharu languages form a dialect continuum so nearby villages have no difficulty understanding each other, even if they may be formally assigned different dialects. With greater separation distance, communication becomes more difficult even within the same nominal dialect.
Tharu languages also exist in continuum with adjacent Indo-Aryan languages. In the west, Tharuhati intermingles with Hindi languages particularly Awadhi. East of the Gandaki Tharuhati intermingles with Bihari languages Bhojpuri, then Maithili further east.  
- Dangaura Tharu reference at Ethnologue (17th ed., 2013)
Kathoriya Tharu reference at Ethnologue (17th ed., 2013)
Rana Tharu reference at Ethnologue (17th ed., 2013)
Chitwania Tharu reference at Ethnologue (17th ed., 2013)
Kochila Tharu reference at Ethnologue (17th ed., 2013)
Buksa Tharu reference at Ethnologue (17th ed., 2013)
(Additional references under 'Language codes' in the information box)
- Also spelled Dang, Dangali, Dangauli, Dangha, Dangora, Dangura and Chaudhari, Chaudhuri
- Also spelled Kathariya, Khatima
- Also spelled Chitawan or Chituan
- Saptari, Morangiya, Udayapur, Sunsari, Siraha, Mahottari, Sarlahi, Dhanusa
- Boehm, Kelly Kilgo. 1997. Language use and language maintenance among the Tharu of the Indo-Nepal tarai
- Yadava, Yogendra P. "Multilingual contexts in the Tarai: Issues in Nepalese perspective", The Role of NGOs/INGOs in Developing Tarai, Kathmandu, Nepal. Nov. 14-15, 2011. http://madhesh.net/conf/docs/YPYadav_DEVM2011.ppt