Leeds District Police would like to speak to anyone who has seen or has information about Megan Schofield from Swarcliffe in Leeds.
Megan was reported missing on Monday morning (22/8) and a number of enquiries have been ongoing to find her.
She is described as white, 5ft tall, thin with shoulder length blonde hair, blue-green eyes, and as generally looking older than her age.
The 13-year-old was last seen wearing black jeans, black leather jacket and black and white shoes.
Detective Inspector Charlotte Hails of Leeds District Police, said: "Megan is only 13 and as time goes by we are becoming increasingly concerned for her welfare.
"I would ask Megan or anyone who has any information about her whereabouts to contact West Yorkshire Police on 101 referencing log number 536 of August 22nd."