The Tonda languages form a branch of the Yam language family of southern New Guinea.

There are over 10 languages.

[1] Tonda languages share some areal features are shared with the Kolopom languages.

[2] The Tonda languages are:[1][3] Notes (see Evans 2018: 681): Tonda languages are unique for their base-6 numeral systems, which likely originated from counting yams (rather than fingers or body parts as with most other languages).

[2]