Eystein or Eysteinn is the name of:
Eystein Erlendsson (d. 1188), Norwegian bishop and saintEystein Halfdansson (fl. c. 730), king of Romerike and Vestfold in what is now NorwayEystein Haraldson (died 1157), king of NorwayEystein Ivarsson (d. 830) was Jarl of Oplande and Hedmark in NorwayEystein Magnusson (c.1088–1123), king of NorwayEystein Meyla (died 1177), also known as Eystein Eysteinson, Norwegian pretenderEysteinn legendary Swedish king