Three Hearts Marathonis amarathon, organised inRadenciinSlovenia. It has been taking place since 1981 and attracts several thousand people each year. In addition to the marathon, ahalf marathon(21km), recreative running (10km) and a 5k.

The event was the Slovenian national championships race from 1992 to 1998 and has hosted the national race in even-numbered years since then, now sharing the honour with theLjubljana Marathon.