Diede de Groot (pronounced [ˈdidə də ˈɣroːt] ⓘ; born 19 December 1996) is a Dutch professional wheelchair tennis player who is the current world No.

De Groot was born with unequal leg length and began her wheelchair tennis career at age seven.

[9] During her time with the ITF, De Groot won the Cruyff Foundation Junior Masters in 2013 in singles and doubles.

[20] De Groot became the first woman in wheelchair tennis to win both the women's singles and doubles events at Wimbledon in July 2018.

[22] At the following Grand Slams, De Groot and Van Koot won the 2019 doubles titles at the French Open and Wimbledon.

[18][23] Outside of the Grand Slam tournaments, De Groot competed at the 2016 Summer Paralympics in singles and doubles competitions.

[9] De Groot also competed at the 2020 Summer Paralympics, winning gold medals in both singles and doubles.

De Groot won the singles title at the 2023 European Para Championships in Rotterdam, Netherlands, defeating compatriot Aniek van Koot in two sets.

It was her 21st singles title at a Grand Slam tournament, equaling a record set by compatriot Esther Vergeer.