Police are searching for missing Hamilton woman Mi-Sook Yang, known as Annie, who has been missing since Thursday.

Annie was last known to be in the Pukete area of Hamilton at around 5pm on Thursday and hasn't been seen since.

Police have been making various efforts to locate her, says Detective Sergeant Jason Earl.

The Police National Dive Squad assisted with a search of the Waikato River at Pukete but nothing of interest was located, says Jason.

"LandSAR is assisting the Police National Dive Squad in the search of the Waikato River.

"Annie's disappearance is out of character and Police and her family have serious concerns for her welfare."

Annie is Korean and was last seen wearing a black puffer jacket, black jeans and black round glasses as seen in the picture attached.

Police ask that anyone who may have seen Annie since Thursday evening contacts Hamilton Police on 07 858 6200.

If you see Annie, please ring 111 immediately.