| Name: | Costello van Steenis |
| Alias: | The Spaniard |
| Nation: | Netherlands |
| Team: | MMA Vlaardingen / Fight Team Wondel |
| Weight Class: | Middleweight |
| Born: | July 26, 1992 |
| Height: | 73.00 in / 185.42 cm |
| Weight: | 185.0 lbs / 83.91 kg |
| Reach: | N/A |
| Leg Reach: | N/A |
| Pro MMA debut: | April 5, 2014 |
| MMA Record: | Sherdog |