Andreia do Nascimento dos Santos, 43, has been reported missing since Tuesday, 21 July.
The woman is between 1.50m and 1.60m tall, of a heavier build, and has long brown hair.
At the time she disappeared, she was wearing a burgundy shirt, black leggings, and two different white socks.
Anyone with information is asked to contact the police at (+352) 244 57 1000 or by email at police.portedusud@police.etat.lu.
