Catherine Astrid Salome Freeman is an Aboriginal Australian former sprinter, who specialised in the 400 metres event. Her personal best of 48.63 seconds currently ranks her as the eighth-fastest woman of all time, set while finishing second to Marie-José Pérec's number-four time at the 1996 Olympics. She became the Olympic champion for the women's 400 metres at the 2000 Summer Olympics, at which she lit the Olympic Flame.

The 400 metres, or 400-meter dash, is a sprint event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the entire course. In many countries, athletes previously competed in the 440-yard dash (402.336 m)—which is a quarter of a mile and was referred to as the "quarter-mile"—instead of the 400 m (437.445 yards), though this distance is now obsolete.