Fifty-year-old Hossine Nazari was last seen at about 6.45am last Monday (July 18) and is said to have links to Dorset.
He is described as about 5’9”, of medium build, and has greying black, cropped hair.
Posting an appeal on social media, a spokesperson for Chichester Police said: “Have you seen Hossine Nazari? He's missing from Chichester.
“He was last seen at about 6.45am on Monday, July 18.
“He is 50, 5’ 9” and medium build with black, cropped hair which is greying. He has links to Dorset.
“Can you help? Report online or call 101 quoting 805 of 18/07.”