Police are appealing for information on the whereabouts of Mr Mohamed Su'aimi Hassan.
The 68-year-old was last seen in Lorong 8 Toa Payoh on Tuesday at about 2.45pm.
Mr Su'aimi is said to be of medium-built, about 1.6m tall, tanned, with short, black hair. He was last seen wearing a white short-sleeve T-shirt, dark pants and black slippers.
Anyone with information about his whereabouts should call the police hotline at 1800-255-0000.