| Joop Kasteel | |
| Other Names: | De Zwarte Parel (the black pearl) |
| Birth Date: | 27 August 1964 |
| Birth Place: | Amersfoort, Netherlands |
| Residence: | Amsterdam, Netherlands |
| Height: | 1.91 m[1] |
| Weight: | 120 kg |
| Weight Class: | Heavyweight |
| Style: | Kickboxing |
| Stance: | Orthodox |
| Fighting Out Of: | Netherlands |
| Rank: | Mike's Gym Team Hardcore |
| Years Active: | 1995–present |
| Mma Kowin: | 8 |
| Mma Subwin: | 8 |
| Mma Decwin: | 1 |
| Mma Dqwin: | 1 |
| Mma Otherwin: | 1 |
| Mma Koloss: | 8 |
| Mma Subloss: | 4 |
| Mma Otherloss: | 1 |
| Sherdog: | 1484 |
Joop Kasteel, also known as "de zwarte parel" ("the black pearl", born 27 August 1964), is a Dutch former mixed martial artist. He made his mixed martial arts debut on 15 June 1996. He is a veteran of the RINGS promotion and as he has fought the majority of his fights for them.[1]
Kasteel's trainers were Chris Dolman, Hans Nijman and Michel van Halderen he also stated he trained with "Dirty" Bob Schrijber. As a former bodybuilder he went into the MMA world & became one of the most popular Dutch fighters noted for his power and physique, normally weighing in at around 265 lbs.
|-| Win| align=center| 19–13| Dan Severn| KO (knee & punches)| Rings Holland: Men of Honor| | align=center| 1| align=center| 0:46| Netherlands| |-| Loss| align=center| 18–13| Cheick Kongo| KO (punch)| Rings Holland: World's Greatest| | align=center| 1| | Netherlands| |-| Win| align=center| 18–12| Peter Verschuren| DQ| It's Showtime 2003 Amsterdam| | align=center| 2| align=center| 5:00| Netherlands| |-| Loss| align=center| 17–12| Jerrel Venetiaan| KO (punches)| 2H2H 6: Simply the Best 6| | align=center| 1| align=center| 6:28| Netherlands| |-| Win| align=center| 17–11| Dave Vader| Submission (scarf hold)| Rings Holland: One Moment In Time| | align=center| 1| | Netherlands| |-| Win| align=center| 16–11| Barrington Renford Patterson| Submission (neck crank)| It's Showtime – As Usual / Battle Time| | align=center| 1| | Netherlands| |-| Loss| align=center| 15–11| Paul Cahoon| Submission (exhausation)| 2H2H 4: Simply the Best 4| | | | Netherlands| |-| Win| align=center| 15–10| Fatih Kocamis| Submission (armlock)| Rings Holland: Some Like It Hard| | align=center| 1| align=center| 1:57| Netherlands| |-| Win| align=center| 14–10| Hubert Numrich| Submission (armlock)| BOA 3: Battle of Arnhem 3| | align=center| 1| | Netherlands| |-| Loss| align=center| 13–10| Paul Cahoon| KO (punch)| Rings Holland: No Guts, No Glory| | align=center| 2| | Netherlands| |-| Win| align=center| 13–9| Roman Zentsov| Submission (shoulder lock)| MillenniumSports: Veni Vidi Vici| | | | Netherlands| |-| Win| align=center| 12–9| Yuriy Kochkine| Decision (unanimous)| Rings Holland: Heroes Live Forever| | align=center| 2| align=center| 5:00| Netherlands| |-| Loss| align=center| 11–9| Bobby Hoffman| KO (punches)| Rings: King of Kings 2000 Block B| | align=center| 1| align=center| 0:43| Osaka, Japan| |-| Win| align=center| 11–8| Lee Hasdell| TKO (shoulder injury)| Rings Holland: Di Capo Di Tutti Capi| | align=center| 1| align=center| 1:18| Netherlands| |-| Loss| align=center| 10–8| Gilbert Yvel| KO (palm strikes)| Rings Holland: There Can Only Be One Champion| | align=center| 1| align=center| 4:16| Netherlands| |-| Loss| align=center| 10–7| Tariel Bitsadze| TKO| Rings: Rings Georgia| | align=center| 1| align=center| 4:11| Georgia, United States| |-| Loss| align=center| 10–6| Kiyoshi Tamura| Submission (armbar)| Rings: Rise 5th| | align=center| 2| align=center| 2:17| Japan| |-| Win| align=center| 10–5| Tariel Bitsadze| Submission (keylock)| Rings: Rise 4th| | align=center| 1| align=center| 6:01| Japan| |-| Loss| align=center| 9–5| Mikhail Ilyukhin| Submission (achilles lock)| Rings: Rise 3rd| | align=center| 1| align=center| 9:40| Japan| |-| Loss| align=center| 9–4| Yoshihisa Yamamoto| TKO (palm strikes)| Rings: Rise 2nd| | align=center| 1| align=center| 7:32| Japan| |-| Win| align=center| 9–3| Henk Kuipers| KO (palm strikes)| Rings Holland: Judgement Day| | align=center| 1| | Netherlands| |-| Win| align=center| 8–3| Masayuki Naruse| TKO| Rings: World Mega Battle Tournament| | align=center| 1| align=center| 8:33| Japan| |-| Win| align=center| 7–3| Herman van Tol| KO (kick to the body)| Rings Holland: Who's the Boss| | | | Netherlands| |-| Loss| align=center| 6–3| Zaza Tkeshelashvili| Submission| Rings: Third Fighting Integration| | align=center| 1| align=center| 5:54| Tokyo, Japan| |-| Win| align=center| 6–2| Ameran Bitsadze| Submission (arm triangle choke)| Rings Holland: The King of Rings| | align=center| 1| align=center| 2:15| Netherlands| |-| Loss| align=center| 5–2| Kiyoshi Tamura| KO| Rings: Battle Dimensions Tournament 1997 Final| | | | | |-| Win| align=center| 5–1| Lee Hasdell| Submission (headlock)| Rings: Mega Battle Tournament 1997 Semifinal 1| | align=center| 1| align=center| 8:55| Japan| |-| Loss| align=center| 4–1| Pete Williams| TKO (knee injury)| Rings: Extension Fighting 7| | align=center| 1| align=center| 8:25| Japan| |-| Win| align=center| 4–0| Pedro Palm| KO (palm strikes)| Rings Holland: Utrecht at War| | align=center| 1| | Netherlands| |-| Win| align=center| 3–0| Mitsuya Nagai| TKO (lost points)| Rings: Extension Fighting 2| | align=center| 1| align=center| 6:27| Japan| |-| Win| align=center| 2–0| Mitsuya Nagai| KO (punches)| Rings Holland: The Final Challenge| | align=center| 1| align=center| 5:12| Netherlands| |-| Win| align=center| 1–0| Rusky Rodgers| N/A| Fight Gala: Mix Fight Night| | | | Netherlands|