Petar Kovačić (20th century) was a resident of Hrvatsko zagorje, from the House of Kovačić. He was a son of Nikola Kovačić and his third wife Marica, and thus a younger half-brother of Marica Koščević, wife to Valent Koščević. He went to either Zagreb or Germany. His half-niece is Ivkica Jakšić.
Petar’s name comes from the Latin word petra, which comes from the Greek word petros – "rock". His surname Kovačić means "the smith’s son".