Northern Territory Police hold concerns for 59-year-old Daniel Plain.
Mr Plain was last seen on Wilshire Street in Alice Springs at around 8:00pm on Monday 23 March 2020.
Mr Plain is described as Caucasian, of slender build, and six-foot tall with grey hair and beard. He was last seen wearing a green short-sleeve shirt, red shorts, and black thongs.
Police are particularly concerned because Mr Plain suffers from dementia.
Anyone with information on his whereabouts is urged to contact police on 131 444. Please quote reference number 9256042.