(updated December 12, 2021)
ABSOLUTE: The No. 1 performers in all the standard events for the 2021 calendar year, indoors & out combined. When an altitude-aided mark is a leader, the low-altitude best is also given, and when an indoor mark is a leader, the outdoor best is also given.
| Absolute Men | Absolute Women |
| •World Leaders | •World Leaders |
| •U.S. Leaders | •U.S. Leaders |
| •NCAA Leaders | •NCAA Leaders |
| •High School Leaders | •High School Leaders |
INDOOR: The No. 1 performers in all the standard events for the 2021 indoor season, considered to have begun on December 01, 2020. When an altitude-aided mark (over 1000m) is a leader, the low-altitude best is also given; the same applies to oversized-track performances.
| Indoor Men | Indoor Women |
| •World Leaders | •World Leaders |
| •U.S. Leaders | •U.S. Leaders |
| •NCAA Leaders | •NCAA Leaders |
| •High School Leaders | •High School Leaders |