The Magahi language (𑂧𑂏𑂯𑂲), also known as Magadhi (𑂧𑂏𑂡𑂲), is a language spoken in Bihar, Jharkhand and West Bengal states of eastern India, and in the Terai of Nepal. Magadhi Prakrit was the ancestor of Magahi, from which the latter's name derives.

It has a very rich and old tradition of folk songs and stories. It is spoken in nine districts of Bihar (Gaya, Patna, Jehanabad, Aurangabad, Nalanda, Sheikhpura, Nawada, Lakhisarai, Arwal), eight districts of Jharkhand (Hazaribag, Palamu, Chatra, Koderma, Jamtara, Bokaro, Dhanbad, Giridih) and in West Bengal's Malda district. There are around 20,700,000 speakers of Magahi, including speakers 12 million Magahi and 8 million Khortha which is considered a dialect of Magahi.

Magahi derived from the ancient Magadhi Prakrit, which was created in the ancient kingdom of Magadha, the core of which was the area south of the Ganges and east of Son River.

Though the number of speakers in Magahi is about 12.6 million, it has not been constitutionally recognised in India. In Bihar, Hindi is the language used for educational and official matters. Magahi was legally absorbed under Hindi in the 1961 Census.