Passers-by saved a girl from further danger after a stranger tackled the 11-year-old to the ground at Lawnton, north of Brisbane, on Saturday afternoon.

Police said the girl was grabbed by the waist and pulled to the ground by a man while she was walking alone to her friend's house at 3.20pm on Saturday.

Detective Senior Sergeant Joe Zitny said the local girl received no physical injuries after the man "tackled her without warning" while walking on an overpass on Francis Road.

Detective Senior Sergeant Joe Zitny appeals for information from the public after an 11-year-old girl was tackled to the ground by a stranger at Lawnton, Queensland. Credit:Queensland Police Service

"As a result, passers-by have started shouting at the man who ultimately has then left on foot and ran away through a park towards the direction of Park Lane," he said.