Girl, 11, missing from Sydney home

An 11-year-old girl has gone missing from northern Sydney.

Scarlett Mitchell was last seen at her home on Holt Avenue, Mosman, shortly before 8.30am (AEDT) on Monday, police say.

But she never showed up at school and has not been seen since.

She is described as being of Caucasian appearance and medium height, with a thin build, long brown straight hair and brown eyes.

Anyone with information can contact Crime Stoppers 1800 333 000.