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.
|Full name||Joannes Henricus Knottenbelt|
|Native name||Joop Knottenbelt|
|Born||25 October 1910|
Lhokseumawe, Sumatra 
|Died||26 February 1998 (aged 87)|
Altea, Spain 
|Grand Slam Singles results|
|Grand Slam Doubles results|
|Grand Slam Mixed Doubles results|
In 1927 he won the Dutch youth (under 18) championships. 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. In the 1932 Wimbledon mixed doubles, he and Madzy Rollin Couquerque lost in the fourth round to Ellsworth Vines and Helen Wills-Moody.
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. In September 1937 Knottenbelt left again for the Dutch East Indies.
- Military registration
- Obiturary, NRC Handelsblad, February 1998
- Winners Dutch Youth Championships Tennis
- Wimbledon 1931 (Gentlemen), Scoreshelf.com, retrieved 23 October 2012.
- "Vines Wins, Wood and Shields Lose: Sarah Palfrey and Mangin Out at Wimbledon", Boston Globe, 29 June 1932 (payment required).
- Utrechts Nieuwsblad, 29 June 1932 (pdf) (in Dutch)
- Josef KNOTTENBELT, Davis Cup, retrieved 21 October 2012.
- A. Knottenbelt overladen, Leidsche Courant, 21 November 1932
- Knottenbelt and Rinkel naar Indië, Leidsch Dagblad, 16 September 1937, p. 11
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