The feline, a lioness, jumped through the open window of the couple’s car and started mauling the woman, a park official said.
Paramedics were called to the scene but she died from her injuries, while the man is still receiving treatment.
The popular Lion Park is 19 miles north of Johannesburg.
The park’s rules forbid visitors from driving through the lion enclosure with their windows down
Park rangers chased the lioness away after the attack, and it is not clear whether the animal will now have to be put down.
Local media are reporting that the woman’s death marks the third incident in the past four months at the park.
The official South African tourism website describes the park as a “hybrid between a zoo and a game reserve”, while the Lion Park’s website says “super close-up animal views” are guaranteed. Cheetahs, spotted hyenas and giraffe are also in the park.
The Lion Park is one of South Africa’s most popular destinations, attracting tourists from around the world.
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