Tymchuk () is a Ukrainian surname. It derives from the Christian name Timothy, and its Ukrainian derivatives, Tymko. The surname, Tymchuk, was created by adding the Ukrainian patronymic suffix, -uk, meaning someone of Tymko, usually the son of Tymko. It may refer to the following individuals: Dmytro Tymchuk (1972–2019), Ukrainian military expert and blogger Yakiv Tymchuk (1919–1988), Ukrainian Greek Catholic clandestine bishop Related surnames Tymoshenko Tymoschuk Surnames of Ukrainian origin Ukrainian-language surnames Patronymic surnames