WA Police and the Department of Communities are seeking assistance from the public to find a teenage girl who hasn't been seen since Thursday.

Anna Smigrodzki, 13, was last seen at a McDonald's in East Perth on Thursday night and the Department of Communities said there were concerns for her wellbeing.

Police believe she may have travelled to Albany to visit a boyfriend she met online.

Anna is 168 centimetres tall with a large build, blue/green eyes, long blonde hair and fair skin.

She may be dressed in a beige hoodie and black shorts and carrying a floral backpack.

Anyone who sees Anna, has information on her whereabouts or is able to assist in
locating her, should contact Police immediately on 131 444, or contact Crime Stoppers on
1800 333 000.