Katinka Hosszú is a Hungarian competitive swimmer specialized in individual medley events. She is a three-time Olympic champion and a nine-time long-course world champion.

Hosszú is the current world record holder in 100-meter individual medley, 200-meter individual medley (long course and short course), 400-meter individual medley (long course), 100-meter backstroke (short course) and 200-meter backstroke (short course). She was the first swimmer (male or female) to hold world records in all five individual medley events at the same time. She holds two-thirds of the Hungarian national records. Hosszu was named FINA Swimmer of the Year in 2014, 2015, 2016 and 2018, and won SwimSwam's Swammy Award for Female Swimmer of the Year in 2013.

She has competed at four Summer Olympics: 2004, 2008, 2012 and 2016. Hosszú currently swims for her own team Iron Swim Budapest. After a long tenure under head coach Shane Tusup, who was her husband, following their divorce Hosszú was coached by Dave Salo before moving onto Árpád Petrov. She is one of the most versatile swimmers in the world, and was nicknamed the "Iron Lady", which she has since turned into a fast growing International brand. In 2014 she became the first race-prize dollar millionaire (man or woman) in swimming history.

According to Forbes magazine she is considered the most valuable Hungarian athlete, ranking the first position for the last five years.

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