Leonard Adrian "Bill" Westmaas (28 May 1923 – 25 August 2011) was a Guyanese cricketer. He played in eight first-class matches for British Guiana from 1945 to 1948.
| Format | Matches | Runs | Avg | 100s/50s | Top Score | Wickets | Bowl Avg | Best Bowling | Catches/St |
| First-class | 8 | 456 | 28.50 | 1/1 | 111 | 1 | 1.00 | 1/1 | 5/– |
