Shia LaBeouf called 911 after coming face-to-face with an intruder at his L.A. home ... and you hear Shia scream at the strange woman, "Don't touch me!."
LaBeouf -- who sounds relatively calm -- tells dispatchers a woman who'd been stalking him for weeks was right at his door.
Cops arrested 31-year-old Graciela Nahle. Law enforcement tells us ... she's been there twice ... both times skulking around.
Nahle copped a quick plea after last weeks' arrest .... no contest to trespassing. She was sentenced to 45 days in jail ... but she was out in just 4 days.
She's also been ordered to stay far away from LaBeouf.
Good luck with that.