Teenage boy missing in southern Sydney

A teenage boy has gone missing from southern Sydney.

Joshua Dominikovic, 13, was last seen at 4pm at Hurstville Railway Station last Wednesday, police say.

He is Asian, 140cm tall with a thin build, short brown hair and brown eyes.

Police say he often goes to Hurstville and Cronulla.

"Family and police hold serious concerns for his welfare due to his age and urge anyone who sees Joshua to come forward," they said.

Anybody who can help should contact St George Police Station on 02 4566 7499 or Crime Stoppers on 1800 333 000.