Police say they are increasingly concerned for the well-being of Colin Smithers, 38.
He was reported missing from Crowborough and has not been seen since June 17.
He is described as white, 5’9”, of medium build, with thinning, very short brown hair and a neat beard and moustache.
He wears dark-rimmed glasses.
He was last seen in the Bricklayers Arms public house in Whitehill Road, Crowborough.
It is believed that he may have ties to Kent, Cambridgeshire and North Yorkshire, said police.
Contact Sussex Police online or by phoning 101, quoting serial 353 of 24/06.