'Fabian' was a British special forces operation by the Belgian Independent Parachute Company (5^th Special Air Service) near Nykerk in the German-occupied Netherlands to collect intelligence about German dispositions in the north-western part of the Netherlands and locate V-2 launching sites (16 September 1944/14 March 1945).

Originally designated 'Regan', this five-man operation remained in the Arnhem region and gathered some intelligence as well as liaising with the Dutch resistance forces in helping Allied paratroopers to evade German capture and incarceration in the aftermath of 'Market'.