A 30-year-old woman was seriously injured in a four-story fall from a Bronx apartment building, police said Sunday.

The woman, whose identity was not released, was listed in critical condition at St. Barnabas Hospital after she plummeted from a fourth-floor window of a Marion Avenue apartment around 3:15 p.m., police said.

It was not clear if there was anyone else inside the apartment at the time, but no foul play was suspected, cops said.