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In phonology, the ts-ch merger is the merger of the voiceless alveolar affricate and the voiceless postalveolar affricate.

In Russian language it is the merger of the consonants rendered by letters Che and Tse. If the shift is towards Tse it, is called tsokanye (цоканье), the shift towards Che is called chokanye (чоканье).

In Polish language the ch->ts merger is part of a more general dialectal feature called Mazurzenie, after the dialect of Mazovia.

The sabesdiker losn feature of the Northeastern Yiddish includes the ch->ts merger.