Delwyn Anne Costello (14 January 1960 – 4 August 2018) was a New Zealand cricketer who played as a right-arm medium bowler. She appeared in 1 Test match and 7 One Day Internationals for New Zealand in 1985. She played domestic cricket for Canterbury.
| Format | Matches | Runs | Avg | 100s/50s | Top Score | Wickets | Bowl Avg | Best Bowling | Catches/St |
| WTest | 1 | 0 | 0.00 | 0/0 | 0 | 2 | 52.00 | 2/77 | 0/– |
| WODI | 7 | 1 | 1.00 | 0/0 | 1 | 2 | 69.50 | 2/37 | 1/– |
| WFC | 24 | 12 | 6.00 | 0/0 | 10* | 50 | 16.56 | 5/33 | 3/– |
| WLA | 14 | 17 | 17.00 | 0/0 | 9* | 11 | 27.45 | 4/4 | 3/– |
