Dean Andrew Cosker (born 7 January 1978) is an English cricket referee and former cricketer. He is a right-handed batsman and a left-arm slow bowler who played for Glamorgan. He has played in first-class, List A and Twenty20 cricket. He attended Millfield School in Somerset between 1991 and 1996.
| Format | Matches | Runs | Avg | 100s/50s | Top Score | Wickets | Bowl Avg | Best Bowling | Catches/St |
| FC | 248 | 3,444 | 14.78 | 0/2 | 69 | 597 | 36.31 | 6/91 | 150/– |
| LA | 252 | 827 | 10.88 | 0/1 | 50* | 260 | 32.81 | 5/54 | 91/– |
| T20 | 128 | 173 | 15.72 | 0/0 | 21* | 100 | 30.32 | 4/25 | 38/– |
