Police are searching for an unknown man after a serious assault in Queenstown last night.

Acting Sergeant Heaeen Chung said a 24-year-old resort man was taken to Lakes District Hospital with a suspected skull fracture after being "stomped on the head several times" by the offender outside the Hotel St Moritz on Brunswick St about 10.30pm.

The offender then ran in the direction of Thompson St.

Acting Sgt Chung said anyone who saw a man acting suspiciously in the area between 10.30pm and 11pm should call police: (03) 441-1600, Crimestoppers 0800 555 111.