The 2019 IAAF World Relays was held in Yokohama, Japan from May 11 to May 12, 2019.

[1] Two new events were established for 2019, both mixed events: the 2 × 2 × 400 m relay and the shuttle hurdles relay.

[3] *   Host nation (Japan)Teams scored for every place in the top 8 with 8 points awarded for first place, 7 for second, etc.

The overall points winner was given the Golden Baton.

[4] 43 nations took part in the competition.