Joannes Henricus "Joop" Knottenbelt internationally known as Josef Knottenbelt (1910 – 1998) was a Dutch tennis player. He was a member of the Netherlands Davis Cup team with among others Henk Timmer.
In 1927 he won the Dutch youth (under 18) championships.Winners Dutch Youth Championships Tennis In 1931, Knottenbelt reached the second round of the men's singles at Wimbledon, losing to Eberhard Nourney of Germany, 8–10 6–2, 0–6 9–11.Wimbledon 1931 (Gentlemen), Scoreshelf.com, retrieved 23 October 2012. In the 1932 Wimbledon mixed doubles, he and Madzy Rollin Couquerque lost in the fourth round to Ellsworth Vines and Helen Wills-Moody., Boston Globe, 29 June 1932 (payment required).Utrechts Nieuwsblad, 29 June 1932 (pdf)
In the quarterfinals of the 1934 Davis Cup, he lost to Swedes Curt Östberg (1–6, 1–6, 4–6) and Kalle Schröder (1–6, 5–7, 0–6) although the Netherlands won the round.Josef KNOTTENBELT, Davis Cup, retrieved 21 October 2012.
Knottenbelt was born in the Dutch East Indies but grew up in Bussum. His younger brother Anthony Knottenbelt was also a promising tennis player, but died at the age of 19 after an accident.A. Knottenbelt overladen, Leidsche Courant, 21 November 1932 In September 1937 Knottenbelt left again for the Dutch East Indies.Knottenbelt and Rinkel naar Indië, Leidsch Dagblad, 16 September 1937, p. 11
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