Courtesy of International Winter Swimming Association.

25m Breaststroke World Records:
Alexandra Degtyareva (Belarus) on March 9th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 17.56
Tobias Wybierek (Germany) on March 9th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 14.53

25m Butterfly World Records:
Darya Borosh (Belarus) on November 3rd at the 2017 Jelgavas Roni Cup in Jelgava, Latvia 15.16
Yaroslav Pronin (Belarus) on November 3rd at the 2017 Jelgavas Roni Cup in Jelgava, Latvia 12.23

25m Freestyle World Records:
Yuliya Arlamenkova (Russia) on November 17th at the 2017 Russian Pacific Open Cup in Vladivostok, Russia 13.97

Aleksandr Morgunov (Russia) on November 17th at the 2017 Russian Pacific Open Cup in Vladivostok, Russia 11.16

50m Breaststroke World Records:
Aleksandra Bednarek (Poland) on March 10th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 37.89
Tobias Wybierek (Germany) on March 10th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 31.85

50m Freestyle World Records:
Alexandra Degtyareva (Belarus) on March 7th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 30.52
Aleksandr Morgunov (Russia) on November 17th at the 2017 Russian Pacific Open Cup in Vladivostok, Russia 24.75

100m Breaststroke World Records:
Ute Holt (Germany) on March 6th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 1.26.51
Sebastian Engel (Germany) on March 6th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 1.14.16

100m Freestyle World Records:
Margarita Karpacheva (Russia) on March 10th at the 2016 Winter Swimming World Championships in Tyumen, Russia 1.05.57
Yaroslav Pronin (Belarus) on March 6th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 54.38

200m Breaststroke World Records:
Aleksandra Bednarek (Poland) on March 7th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 3.00.53
Sebastian Engel (Germany) on March 7th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 2.48.21

200m Freestyle World Records:
Julia Wittig (Germany) on March 7th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 2.23.08
Yaroslav Pronin (Belarus) on November 17th at the 2017 Russian Pacific Open Cup in Vladivostok, Russia 2.02.59

450m Freestyle World Records:
Ines Hahn (Germany) on March 6th at the 2018 Winter Swimming World Championships in Tallinn, Estonia 5.40.57
Petar Stoychev (Bulgaria) on March 12th at the 2016 Winter Swimming World Championships in Tyumen, Russia 5.25.39

For more information about the International Winter Swimming Association, visit here.

Two-time world record holder Yaroslav Pronin is shown above with