400 m individual medley, women

What to remember

On June 11, 2025, still at the Canadian Trials in Victoria, Summer McIntosh finished the 400 m individual medley in 4 min 23.65 s. It was her third world record of the week, after the 400 m freestyle and the 200 m individual medley. The men's record over the distance is held by France's Léon Marchand.

The 400 metres individual medley is swimming's all-round test: all four strokes in turn, a hundred metres each. It has been on the Olympic programme since 1964 for both men and women, and has featured at every World Aquatics Championships, starting with the inaugural one in 1973.

McIntosh also rules the event in competition. She won both the Olympic title and the long course world title, as Marchand did among the men, and she holds the short course world record as well. The Canadian has won two Commonwealth Games gold medals and four short course world titles.