Middlesbrough FC All Time Appearances
| Player | Apps |
|---|---|
| Zack Steffen | 45 |
| Yannick Bolasie | 15 |
| Yanic Wildschut | 15 |
| Yakubu | 104 |
| WS Roberts | 4 |
| Willy Falconer | 59 |
| Willo Flood | 16 |
| Willie Whigham | 213 |
| Willie Wardrope | 73 |
| Willie Maddren | 357 |
| Willie Fernie | 67 |
| Williams Kokolo | 2 |
| William White | 8 |
| William Wass | 3 |
| William Wainscoat | 37 |
| William Tucker | 3 |
| William Thompson | 8 |
| William Stage | 3 |
| William Scott | 28 |
| William Robertson | 5 |
| William Pease | 237 |
| William Murray | 17 |
| William Muir | 2 |
| William Millar | 17 |
| William McAuley | 19 |
| William McAllister | 35 |
| William James | 27 |
| William Higgins | 30 |
| William Hickling | 4 |
| William Hick | 17 |
| William Godley | 3 |
| William Fox | 112 |
| William Forrest | 330 |
| William Flint | 1 |
| William Ellerington | 129 |
| William Edward Worrall | 1 |
| William Dugiud | 24 |
| William Davidson | 19 |
| William Carr | 118 |
| William Butler | 2 |
| William Bell | 1 |
| William Barker | 120 |
| William Agnew | 73 |
| Will Hamilton | 12 |
| Wilf Mannion | 366 |
| Walter Tinsley | 88 |
| Walter Holmes | 175 |
| Walter Bottrill | 18 |
| Walter Auld | 2 |
| Wally Briggs | 2 |