Police are seeking assistance from the public to help locate missing person Alison, who was last seen at her Morphett Vale home about 8pm on Friday 29 December.

Alison is 54 years old, Caucasian appearance, 178cm tall, medium build and has brown shoulder-length hair. She was last seen wearing glasses, a purple shirt and black pants.

She is believed to be driving a white 2015 Holden Commodore sedan, with South Australian registration S599BXY.

Police have concerns for her welfare and anyone who sees Alison or her car is asked to call the Police Assistance Line immediately on 131444.