Police are seeking any information on the whereabouts of Carolyn and Rachel Lloyd, aged 45 and 22 respectively.
The mother and daughter were due to check out of their Palmerston North Motel on 27th April.
They were also expected to return their rental vehicle at 11 am this morning.
Carolyn is visiting from the US to see her daughter who is a student at Massey university.
Family members, the rental company and the motel have not heard from either of the women.
They are travelling in a silver Toyota Yaris hire car with the registration DLZ 347.
Anyone with information on the whereabouts of Carolyn Lloyd, Rachel Lloyd or the vehicle should contact Palmerston North Police on 06 351 2535.