Kacper Majchrzak (born 22 September 1992) is a Polish swimmer.

[2] He currently represents the Cali Condors which is part of the International Swimming League.

Majchrzak competed in the 50 m freestyle and 4 × 100m medley relay events at the 2012 Summer Olympics.

[3][4] He finished 10th in the 200 metre freestyle at the 2016 Summer Olympics setting a new national record of 1:46.30.

[5] In 2019, he was a member of the inaugural International Swimming League representing the Cali Condors, who finished third place in the final match in Las Vegas, Nevada in December.