Queensland police have called on the public to help find a 40-year-old woman and her three children who have been missing since last week.

Carly Robson was last seen at Wheaton Street in Narangba, north of Brisbane, on July 11 with her one-year-old son and two daughters aged four and nine.

They have not been heard from since.

Police said they hold serious concerns for their welfare and want anyone with information about their location to come forward.

Ms Robson is described as being Caucasian with a slim build and blonde hair.

She is about 168cm tall.

Police said it was possible she was travelling with the children in the Brisbane area.