Did Olga get baptized in the Eastern Orthodox or Catholic Church?
Eastern Orthodox Church
She didn't get baptized
It is not known
Olga of Kiev was baptized into the Eastern Orthodox Church by missionaries from Constantinople. She was the first ruler of Kievan Rus' to convert to Christianity. Her baptism is credited with helping to spread the religion to the rest of the region.
The Mysterious Reign of Olga of Kiev: Unveiling the Legacy of a Fearless Princess