Ping Lyu was last seen on Stewart St in Addington, Christchurch on Saturday, May 25.
The 41-year-old woman is visiting New Zealand from China.
She has no known relatives in New Zealand and does not speak English.
Police have serious concerns for her welfare and want to establish that she is safe.
Anyone who has seen Ping, or who has information on her whereabouts, is asked to call Police on 111 immediately and reference the file number 240525/9699.
