| Full name: | William Gilfellon Mackay |
| Born: | 15th October 1891, Earsdon Square, Shiremoor, Northumberland, England |
| Died: | 8th August 1962, High Heaton, Newcastle upon Tyne, Northumberland, England |
| Batting: | Right-hand batter |
| Biography: | Birth registered as William McKay |
| Relations: | Brother: PM Mackay; Cousin: W Gilfellon; Son: WG Mackay |
| Teams: | Minor Counties (Other FC: 1929); Northumberland (Minor Counties Championship: 1920-1939); All teams |
| Lists of matches and more detailed statistics | |
| First-Class Career Batting and Fielding (1929) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Minor Counties | 1 | 0 | 0 | ||||||||
| Minor Counties Championship Career Batting and Fielding (1920-1939) | ||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | Ct | ||
| Northumberland | 146 | 262 | 8 | 5579 | 173 | 21.96 | 2 | 24 | 155 | |