Police have serious concerns for a missing 25-year-old Christchurch woman who has not been seen for more than a week.

Lydia Grace Solvander, 25, was last seen in the Hillmorton area on January 17 wearing tights and a sweatshirt.

Any information on her whereabouts or sightings of her can be reported to Christchurch Police on 03 363 7400.