Sinclaire Johnson is an American middle-distance runner. She is the 2022 US champion over 1500 m and has represented her country at the 2022 and 2023 World Championships. Competing for Oklahoma State University, she won the 2019 NCAA 1500 m title.

The distance medley relay (DMR) is an athletic event in which four athletes compete as part of a relay. With its inclusion in the IAAF World Relays program, the IAAF announced on May 1, 2015 that the event would be an official world record event.