Mściwój or Mściwoj is a very old Polish given name of Slavic origin, consists of two elements: ''mści'' "vengeance" and ''woj'', derived from: ''wojna'' (war), ''wojownik'' (warrior) or ''wuj'' (uncle). A related name is: Mścisław. The Pomeranian form is Mestwin.

List of people with the given name Mściwój

* Mestwin (Mściwoj) I, Duke of Pomerania * Mestwin (Mściwoj) II, Duke of Pomerania * Mszczuj of Skrzynno, Polish knight {{DEFAULTSORT:Msciwoj Slavic masculine given names Polish masculine given names Masculine given names