Hryhorchuk is a Ukrainian surname derived from the given name "Hryhor", or Gregory. A variant Ryhorchuk is derived form the simplified variant "Ryhor" of the given name "Hryhor".
- The Russified form is Grigorchuk.
- Belarusian forms: Hryharchuk (from Ukrainian), Grygarchuk (via Russian), or Ryharchuk (native or from "Ryhorchuk").
- Polonized form: Gregorczuk.
- Lithuanized: Grigorčukas (via Russian), Gregorčukas (via Polish)
Notable people with the surname include: