Martin Štěpánek (born June 5, 1977 in Náchod, Czech Republic) is a world class freediver and record-holder.

This biography of a living person needs additional citations for verification. (September 2019)

From 1984 to 1997 he was a competitive monofin swimmer (finswimmer) (distances 50m and 100m). Martin's academic background follows a degree in Forestry Engineering with advanced studies in Sports Biology at the Charles University in Prague, Czech Republic. After moving to the United States he became USA Certified as a Deep Sea and Saturation Commercial Diver in May 1999. In 2000 Martin met Douglas Peterson, who went on to become his freediving coach and mentor, guiding him to his first World Record in July 2001. Since then, Martin continued to set freediving world records annually up to his retirement from competitive freediving in 2012. He is now recognized as one of the pioneers of modern freediving education.

Martin was on hand during David Blaine's "Drowned Alive" stunt in Lincoln Center in May 2006. Blaine was attempting to hold his breath (known as "apnea") long enough to break the current world record of eight minutes, fifty-eight seconds.^[1]

Martin is the founder of Freediving Instructors International (F.I.I.) the largest^{[according to whom?]} freediving education agency in the United States. He is an advisory board member of DiveWise a non-profit organization dedicated to freediver education and safety and celebrity supporter of Oceana.^[2]

In May 2009, utilizing only his monofin for propulsion, Martin became the first man to dive over 400 feet (120 m) on a single breath of air.