The girl has been found safe and well.
Mandurah Police hold welfare concerns for missing 14-year-old Amelia.
Amelia was last seen on Tuesday afternoon near her home in Halls Head.
She is described as 155 cms tall, slim build, fair skin, long brown hair and a piercing on the left side of her nose.
Amelia was last seen wearing a black top, green cargo pants, an orange hoodie and carrying a pink backpack.
If you have seen or know of Amelia’s whereabouts, please contact the Police Assistance Centre on 131 444 and quote reference number 311977.