 Wharton's prowess was recognised outside Scotland as well and he officiated 16 international matches, from Belfast to Brazil.He also oversaw 24 international club fixtures, including the 1962 Cup Winners Cup Final between Atlético Madrid and Fiorentina at Hampden Park.He officiated in qualifying matches for the 1962 and 1970 World Cups, as well as UEFA Euro 1968 qualifying.