The Thames Challenge Cup is a rowing event for men's eights at the annual Henley Royal Regatta on the River Thames at Henley-on-Thames in England. It is open to male crews from a single rowing club. Boat clubs from any university, college or secondary school are not permitted, neither are squad oarsmen seeking selection for F.I.S.A. Heavyweight or Lightweight Championships. A crew may not include oarsmen who have rowed or sculled in an Olympic Games or a F.I.S.A. Senior World Championships for Heavyweights or Lightweights or who have won a medal at World Under 23 Championships (or the World Under 23 Regatta or The Nations' Cup).