Thomas Moore, 42, was last seen in Upper Ham Road in Kingston upon Thames at 8.15am on June 15.
He was caught on CCTV footage at the junction with Warners Lane after which he disappeared.
Officers are appealing for anyone who may have footage, potentially on doorbell cameras or vehicle dashcams, of Mr Moore around Upper Ham Road to come forward.
He was reported missing on June 19.
Mr Moore hasn’t been seen or heard from since.
A police statement said: “Officers have been carrying out a number of enquiries and are growing increasingly concerned about his whereabouts.
“We are also asking anyone who was in the vicinity of Upper Ham Road on the morning of Wednesday, 15 June to review dash cam and doorbell footage for any sightings of Thomas.”
Anyone with information is asked to call 101 quoting reference 22MIS020988. You can also contact the Missing People charity on 116 000.
