The Khorchin (Mongolian ᠬᠣᠷᠴᠢᠨ Qorčin, Chinese 科尔沁 Kē'ěrqìn) dialect is a variety of Mongolian spoken in the east of Inner Mongolia, namely in Hinggan League, in the north, north-east and east of Hinggan and in all but the south of the Tongliao region. There were 2.08 million Khorchin Mongols in China in 2000, so the Khorchin dialect may well have more than one million speakers, making it the largest dialect of Inner Mongolia.
/t͡ʃʰ/ has been replaced by /ʃ/, and in some varieties, /s/ is replaced by /tʰ/. Then, *u (<*ʊ<*u) has regressively assimilated to /ɑ/ before *p, e.g. *putaha (Written Mongolian budaγ-a) > pata ‘rice’. However, less systematic changes that pertain only to a number of words are far more notable, e.g. *t͡ʃʰital 'capacity'> Khorchin /xɛtl/. This last example also illustrates that Khorchin allows for the consonant nuclei /l/ and /n/ (cp. [ɔln] 'many').