An elderly woman in the United States has had to be rescued by police after three deer crashed through her apartment, trapping her inside her home with the skittish animals.

Two deer in the bathroom had to be tranquilised before being released. ( AP: Kevin Gerber/Decatur Police Department )

Police in Decatur, Indiana, rescued the 74-year-old in her retirement home apartment on Tuesday night (local time) after the deer entered through her bedroom window.

The woman called 911 and officers found her trapped on her living room couch, with her walker on the floor, as one deer jumped back and forth across the room.

Sergeant Kevin Gerber said an officer shielded the woman after that deer knocked her over.

He said officers then subdued and removed that deer, while two others that ended up in the bathroom were tranquilised and released.

He said the woman was not injured and "was amazingly calm" during her ordeal, but the deer heavily damaged her apartment.

AP