List of world under-18 bests in athletics

Under-18 world best performances in the sport of athletics are the best marks set in competition by athletes aged 17 or younger throughout the entire calendar year of the performance. World Athletics (formerly IAAF) maintains an official list for such performances, but only in a specific list of outdoor events. All other records, including all indoor records, shown on this list are tracked by statisticians not officially sanctioned by the world governing body. These age category records were formerly called world youth bests.

Outdoor
Key:

h = hand timing A = affected by altitude OT = oversized track (> 200m in circumference) X = annulled due to doping violation

Indoor
World Athletics does not keep official "bests" in indoor events for the Youth division.