Otylia Jędrzejczak (born December 13, 1983) is a Polish swimmer.
Otylia is the Olympic champion from Athens 2004 in the 200 metre butterfly. She finished 4th in this event in the 2008 Summer Olympics in Beijing. She also swam in a third Olympiad, at the 2000 Summer Olympics in Sydney. In Athens 2004 she also silvered in 400 m freestyle and 100 m butterfly. Three times she broke the world record in the women’s 200 m butterfly (once in the 25-metre pool).
Jędrzejczak was born in Ruda Śląska, Silesian Voivodship, Poland. She started swimming at the age of six as a measure to correct a slight curvature of the spine. At first she hated the sport. Her attitude towards it changed after she had won her first prize in a competition in Germany at the age of eight. Jędrzejczak took up swimming seriously in high school. Led by coach Maria Jakóbik, she won her first titles in the Junior European Championships in 1999. Medals in the Senior European Championships in 1999 and 2000 opened the way to her first Olympic appearance.
- In 1999 she won the 100 m and 200 m butterfly titles during the Junior European Championships in Moscow and a bronze medal in the 200 m butterfly event in the Senior European Championships in Istanbul.
- In 2000 she won gold in the 200 m butterfly and silver in the 100 m butterfly in the European Championships in Helsinki.
- In the 2000 Summer Olympics she placed 5th in the 200 m butterfly.
- In 2001 she placed second in the 100 m butterfly event in the World Championships in Fukuoka.
- On 4 August 2002 she established a new world record in the 200 m butterfly with a time of 2:05.78 during the European Championships in Berlin. Except the 200 m title, she won a silver medal in the 100 m butterfly event.
- During the 2003 World Championships in Barcelona she placed first in the 200 m butterfly and second in the 100 m butterfly.
- In the 2004 European Championships in Madrid she defended her 200 m butterfly title and placed third in the 100 m butterfly event.
- During the 2004 Summer Olympics she won three medals: silver in the 400 m freestyle and 100 m butterfly, and gold in the 200 m butterfly. This equals her in the number of medals earned during single Olympic games with the legendary Polish athlete Irena Szewińska.
- After winning bronze in the 100 m butterfly during the 2005 World Championships in Montreal, Jędrzejczak managed to defend her title in the 200 m butterfly event on 29 July 2005. In the final she improved her own world record with a time of 2:05.61 to beat Australian Jessicah Schipper by only 0.04 seconds. After the race it was disputed that Jędrzejczak touched the finishing wall with only one hand (with video replays confirming this), which according to International Swimming Federation rules would be grounds for an automatic disqualification. But since this was not noticed by the judges and no complaints were filed within 30 minutes of the race, her result has been approved.
- In the summer of 2005 she won three gold medals at the Summer Universiade in İzmir.
- In the 2006 European Championships in Budapest she again defended her 200 m butterfly title and won 200 m freestyle. With her teammates, she took the silver medal in 4×200 m freestyle relay.
- On 13 December 2007, on her 24th birthday, Jędrzejczak broke the world record for the 200 metre women’s butterfly with a time of 2:03.53.