Jan Šefl

{{short description|Czech swimmer}}

{{Use dmy dates|date=August 2020}}

{{Infobox swimmer

| name = Jan Šefl

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| nationality = Czech

| strokes = Butterfly

| club = Slávia VŠ Plzeň (2001-2020); Ústí Swimming Academy (2020 - present)

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| birth_date = {{birth date and age|1990|5|10|df=yes}}

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Jan Šefl (born 10 May 1990) is a Czech swimmer. He competed in the men's 50 metre butterfly event at the 2017 World Aquatics Championships.{{cite web |url=http://omegatiming.com/File/Download?id=000111010A0104EB01FFFFFFFFFFFF01 |title=Heats results |accessdate=29 July 2017 |work=FINA |archive-url=https://web.archive.org/web/20170728133625/http://omegatiming.com/file/download/?id=000111010A0104EB01FFFFFFFFFFFF01 |archive-date=28 July 2017 |url-status=dead }}{{cite web |url=https://fina-budapest2017.com/en/home |title=2017 World Aquatics Championships > Search via Athletes |accessdate=29 July 2017 |work=Budapest 2017 |archive-date=22 October 2018 |archive-url=https://web.archive.org/web/20181022064850/http://www.fina-budapest2017.com/en/home |url-status=dead }} He represented the Czech Republic in men's 100 metre butterfly event at the 2020 Summer Olympic Games in Tokyo.{{cite web |title=Competition Results: Heats Summary |url=https://www.worldaquatics.com/competitions/5/olympic-games-tokyo-2020/results?disciplines=&event=06d60bc7-155c-4db9-b711-b19eb17d073d&unit=heats-summary |website=FINA |access-date=4 October 2023}}{{cite news |last1=Keith |first1=Braden |title=JAN SEFL BREAKS CZECH NATIONAL RECORD; QUALIFIES FOR FIRST OLYMPICS AT AGE 30 |url=https://swimswam.com/jan-sefl-breaks-czech-national-record-qualifies-for-first-olympics-at-age-30/ |access-date=4 October 2023 |publisher=Swim Swam News |date=May 4, 2021}} He holds the men's Czech national record in the event.{{cite web |title=Rekordy |url=https://vysledky.czechswimming.cz/rekordy?mode=DISCIPLINE&disciplineAbbrev=100%20M&ageGroupId=1&gender=MALE&poolLength=50 |website=Český svaz plaveckých sportů |access-date=4 October 2023}}