Botic van de Zandschulp (Dutch pronunciation: [ˈboːtɪk fɑn də ˈzɑntsxʏl(ə)p]; born 4 October 1995) is a Dutch professional tennis player. He has a career-high ATP singles ranking of world No. 22 achieved on 29 August 2022 and a best doubles ranking of No. 60, reached on 22 May 2023. He is currently the No. 1 singles player from the Netherlands.

Van de Zandschulp has won two ATP Tour doubles titles. He represents the Netherlands at the Davis Cup.

Van de Zandschulp's breakthrough occurred at the 2021 US Open, when he became the third qualifier in US Open history to reach the quarterfinals of the tournament (after Nicolas Escudé in 1999 and Gilles Müller in 2008), with wins over seeded players Casper Ruud and Diego Schwartzman. He was also the third man to progress to the main draw of all four majors through qualifying in one year, the others being Elias Ymer in 2015 and Frank Dancevic in 2011.

Van de Zandschulp qualified for the first time in the main singles draw of a Grand Slam tournament at the 2021 Australian Open, where he was defeated by fellow qualifier Carlos Alcaraz. As a result, he reached a career-high of No. 145 on 22 February 2021 and was the No. 1 Dutch tennis singles player for a brief period from 8 February 2021 until 22 March 2021. He also qualified for the second major in 2021 and in his career at the French Open and reached the second round for his first Grand Slam win with a defeat over No. 19 seed Hubert Hurkacz.

In June 2021, the Dutch was upgraded to the main draw at Wimbledon, for his third major debut in a row in 2021, as a lucky loser following the late withdrawal of the 4th seed Dominic Thiem. He beat qualifier Grégoire Barrère in the first round and lost to 7th seed Matteo Berrettini in the second round. In July following Wimbledon, as the second seed, he reached the final at the 2021 Dutch Open in Amersfoort. He was defeated by his compatriot and top seed Tallon Griekspoor in the final. He became the No. 1 Dutch player again on 30 August 2021 at world No. 117 in the rankings.

Despite having only five ATP Tour match wins before the US Open, van de Zandschulp qualified for the last major of the year, thus becoming the only man to progress to the main draw of all four majors through qualifying that year. He reached the third round of a major for the first time, defeating Carlos Taberner and world No. 11 and eight seed Casper Ruud. Next, he defeated Facundo Bagnis to reach the fourth round. There he defeated world No. 14 and eleventh seed Diego Schwartzman in five sets to reach his maiden major quarterfinal, where he lost to eventual champion Daniil Medvedev, becoming the only player to take a set off of Medvedev in the tournament. He also became only the third male qualifier in the history of the US Open (after Nicolas Escudé in 1999 and Gilles Müller in 2008) to reach the quarterfinals. He also became the first Dutch man to reach the quarterfinals of a major since Sjeng Schalken at the 2003 US Open and 2004 Wimbledon. As a result, he improved 55 spots in the singles rankings, entering the top 100 for the first time in his career at world No. 62 on 13 September 2021.

Van de Zandschulp made his debut at a Masters 1000-level event at the Indian Wells Masters by qualifying as the top seed into the main draw. He lost to Marcos Giron in the first round in three sets.

At the 2021 St. Petersburg Open, van de Zandschulp entered as a qualifier and beat Yoshihito Nishioka, Sebastian Korda, and for the biggest win in his career so far, world No.6 and top seed Andrey Rublev in the quarterfinals. He lost to Croatian Marin Čilić in the semifinals. At the 2021 Stockholm Open, he reached the quarterfinals where he lost to second seed Félix Auger-Aliassime. He entered the top 60 at World No. 57 on 15 November 2021