WEC MMA events in 2006
WEC 21: Tapout was a mixed martial arts event held on June 15, 2006. WEC 21's main event was a fight between Rob McCullough and Ryan Healy.
| Main Card |
| Weight class | | | | Method | Round | Time | Notes |
| Lightweight | Rob McCullough | def. | Ryan Healy | TKO (cut) | 1 | 1:52 | |
| Lightweight | Nate Diaz | def. | Joe Hurley | Submission (triangle choke) | 2 | 2:03 | |
| Lightweight | Hermes Franca (c) | def. | Brandon Olsen | Submission (armbar) | 1 | 0:40 | [a] |
| Heavyweight | Justin Eilers | def. | Jimmy Ambriz | TKO (doctor stoppage) | 1 | 5:00 | |
| Light Heavyweight | Brian Stann | def. | Miguel Cosio | TKO (punches) | 1 | 0:16 | |
| Lightweight | Rich Crunkilton | def. | Adam Lynn | Submission (rear-naked choke) | 2 | 1:20 | |
| Welterweight | Mike Penalber | def. | Joe Martin | Decision (split) | 3 | 3:00 | |
| Heavyweight | Kyle York | def. | Jason Glaza | TKO (punches) | 1 | 0:46 | |
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