Arne Koets is a historical European martial arts (HEMA) practitioner and instructor from the Netherlands. Along with Guy Windsor in Finland, he is one of the few people that works as a full-time professional instructor in HEMA. He is a notable figure in the world of HEMA, being an expert in jousting and historical dressage. He runs seminars internationally. Koets has ridden in more than 400 tournaments, in ten countries, on three continents.