| John Tilbrook | |
| Birth Date: | 10 June 1946 |
| Originalteam: | Sturt |
| Height: | 184 cm |
| Weight: | 94 kg |
| Statsend: | 1975 |
| Years1: | 1971–75 |
| Games Goals1: | 53 (59) |
John Tilbrook (born 10 June 1946) is a former Australian rules footballer who played with Sturt in the SANFL in 5 successive Premiership teams 1966 through 1970 inclusive. He transferred to Melbourne in the Victorian Football League (VFL) for the 1971 season, but didn't receive clearance to play until round 12.[1] After an attempt to convert to gridiron in 1974, plus run of poor form and stints in the reserves, he left Melbourne after the 1975 season.[2] Known as Diamond Jim due to the significant transfer fee from Sturt to Melbourne at the time, he was affectionately called Topaz Tilly by Lou Richards.