Ivasyuk (alternative spelling Ivasiuk; Ukrainian: Івасюк), a family name of Ukrainian origin. It is derived from Ivas or Ivasyk (Ukrainian: Івась or Ukrainian: Івасик), the diminutive form of the Ukrainian name Ivan (Ukrainian: Іван), "John", and the suffix -yuk, denoting descent, especially in the Ukrainian Carpathian mountains area.
The surname may refer to the following notable people: