The most referee qualifications across multiple sports is 34, achieved by Andreas Kolettis (Greece) of Pireas, Greece, as of 31 January 2014.
Kolettis is qualified in the following sports: archery, athletics, badminton, basketball, beach handball, beach soccer, beach tennis, beach volleyball, blind football, boccia, boxing, bridge, chess, duathlon, fencing, football, freediving, futsal, mountaineering, paratriathlon, rally car, rugby union, sailing, Special Olympics athletics, Special Olympics bowling, sport fishing, swimming, synchronized swimming, table tennis, tennis, triathlon, underwater shooting, volleyball and wushu kung fu.