The 1968 Isle of Man TT, the third round of the 1968 Grand Prix motorcycle racing season, involved six championship races on the Mountain Course on the Isle of Man during 8–14 June 1968. Giacomo Agostini won both the Junior and Senior races, completing the six laps of the latter race in 2 hours, 13 minutes and 39.4 seconds to win by almost nine minutes[1] The Ultra-Lightweight 50cc race was won by Barry Smith, the Lightweight 125cc race by Phil Read and the Lightweight 250cc by Bill Ivy.
10 June 1968 – 3 Laps (113.00 Miles) Mountain Course.
| Place | Rider | Number | Machine | Speed | Time | Points | |
|---|---|---|---|---|---|---|---|
| 1 |  Barry Smith | 1 | Derbi | 72.90 mph | 1:33.10.4 | 8 | |
| 2 |  Chris M. Walpole | 9 | Honda | 67.26 mph | 1:40.59.6 | 6 | |
| 3 | Les Griffiths | 14 | Honda | 66.12 mph | 1:42.36.0 | 4 | |
| 4 | David Lock | 12 | Honda | 65.66 mph | 1:43.27.8 | 3 | |
| 5 | Jim Pink | 29 | Honda | 64.14 mph | 1:45.54.2 | 2 | |
| 6 | R.M. Udall | 7 | Honda | 67.70 mph | 1:40.03.8 | 1 | |
| DNF |  Angel Nieto | 9 | Derbi |
14 June 1968 – 3 Laps (113.00 Miles) Mountain Course.
| Place | Rider | Number | Machine | Speed | Time | Points | |
|---|---|---|---|---|---|---|---|
| 1 | Phil Read | 2 | Yamaha | 99.12 mph | 1:08.31.4 | 8 | |
| 2 | Bill Ivy | 9 | Yamaha | 97.78 mph | 1:09.27.8 | 6 | |
| 3 | Kel Carruthers | 12 | Suzuki | 86.69 mph | 1:18.21.2 | 4 | |
| 4 | Tommy Robb | 11 | Bultaco | 85.80 mph | 1:19.10.4 | 3 | |
| 5 | Gordon Keith | 7 | Brown Special | 84.88 mph | 1:20.06.4 | 2 | |
| 6 | Steve Murray | 16 | Honda | 83.19 mph | 1:21.09.4 | 1 |
10 June 1968 – 6 Laps (226.38 Miles) Mountain Course.
| Place | Rider | Number | Machine | Speed | Time | Points | |
|---|---|---|---|---|---|---|---|
| 1 | Bill Ivy | 21 | Yamaha | 99.58 mph | 2:16.24.8 | 8 | |
| 2 |  Renzo Pasolini | 5 | Benelli | 98.00 mph | 2:18.36.8 | 6 | |
| 3 | Heinz Rosner | 12 | MZ | 95.04 mph | 2:22.56.4 | 4 | |
| 4 | Malcolm Uphill | 1 | Suzuki | 93.86 mph | 2:24.44.4 | 3 | |
| 5 | Rod Gould | 32 | Yamaha | 93.61 mph | 2:25.07.0 | 2 | |
| 6 | Bill Smith | 3 | Yamaha | 92.26 mph | 2:27.14.8 | 1 |
12 June 1968 – 6 Laps (236.38 Miles) Mountain Course.
| Place | Rider | Number | Machine | Speed | Time | Points | |
|---|---|---|---|---|---|---|---|
| 1 | Giacomo Agostini | 6 | MV Agusta | 104.78 mph | 2:09.38.6 | 8 | |
| 2 | Renzo Pasolini | 17 | Benelli | 102.65 mph | 2:12.19.6 | 6 | |
| 3 | Bill Smith | 7 | Honda | 95.02 mph | 2:22.58.6 | 4 | |
| 4 | Derek Woodman | 15 | Aermacchi | 93.46 mph | 2:25.21.4 | 3 | |
| 5 | John Cooper | 16 | Seeley | 93.35 mph | 2:25.32.0 | 2 | |
| 6 | Jack Findlay | 1 | Aermacchi | 93.04 mph | 2:26.00.0 | 1 |
8 June 1968 – 3 Laps (113.2 Miles) Mountain Course.
| Place | Rider | Number | Machine | Speed | Time | Points | |
|---|---|---|---|---|---|---|---|
| 1 | Siegfried Schauzu/H. Schneider | 7 | BMW | 91.09 mph | 1:14.34.2 | 8 | |
| 2 | Johann Attenburger/J. Schillinger | 2 | BMW | 89.47 mph | 1:15.55.2 | 6 | |
| 3 | Hans Luthringhauser/G. Hughes | 5 | BMW | 87.60 mph | 1:17.32.6 | 4 | |
| 4 | Helmut Fath/W. Kalauch | 4 | BMW | 87.28 mph | 1:17.49.0 | 3 | |
| 5 | John Brandon/C. Holland | 23 | BMW | 82.43 mph | 1:22.24.4 | 2 | |
| 6 | Maurice Tombs/T. Tombs | 14 | BMW | 82.20 mph | 1:22.30.8 | 1 |
14 June 1968 – 6 Laps (236.38 Miles) Mountain Course.
| Place | Rider | Number | Machine | Speed | Time | Points | |
|---|---|---|---|---|---|---|---|
| 1 | Giacomo Agostini | 7 | MV Agusta | 103.63 mph | 2:13.39.4 | 8 | |
| 2 | Brian Ball | 30 | Seeley-Matchless | 95.97 mph | 2:22.08.4 | 6 | |
| 3 | Barry Randle | 39 | Petty Norton | 95.57 mph | 2:22.26.8 | 4 | |
| 4 | Bill Smith | 14 | Matchless | 95.02 mph | 2:22.58.0 | 3 | |
| 5 | Bernie Lund | Matchless | 94.96 mph | 2:22.34.2 | 2 | ||
| 6 | Kel Carruthers | 3 | Norton | 94.23 mph | 2:23.06.4 | 1 |
8 June 1968 – 3 Laps (113.00 Miles) Mountain Course.
| Rank | Rider | Team | Speed | Time | |
|---|---|---|---|---|---|
| 1 | Terry Vinicombe/J. Flaxman | BSA | 85.85 mph | 1.19.07.4 | |
| 2 | Norman Hanks/Rose Arnold | BSA | 83.71 mph | 1.21.44.0 | |
| 3 | Peter Brown/D. Bean | BSA | 83.03 mph | 1.21.48.0 | |
| 4 | Mick Horsepole/G. Horspole | Triumph | 79.53 mph | 1.25.24.0 | |
| 5 | John B. Crick/D. Senior | Triumph | 78.96 mph | 1.21.01.2 | |
| 6 | Ken Graham/G. Sewell | Triumph | 78.45 mph | 1.26.35.4 | |
| 7 | Ernie H. Leece/John Molyneux | LMS | 78.35 mph | 1.26.41.6 | |
| 8 | Derek Plummer/Malcolm Brett | Triumph | 76.98 mph | 1.28.13.8 | |
| 9 | Terry Windle/R. Hinchcliffe | Triumph | 76.49 mph | 1.28.48.8 | |
| 10 | Dave Saville/E. Fletcher | Sabre | 76.26 mph | 1.29.04.0 |
12 June 1968 – 3 Laps (113.00 Miles) Mountain Course.
| Rank | Rider | Team | Speed | Time | |
|---|---|---|---|---|---|
| 1 | Ray Pickrell | Dunstall Norton 750 Dominator | 98.13 mph | 1.09.13.2 | |
| 2 | Billie Nelson | Norton | 94.62 mph | 1.11.47.2 | |
| 3 | Tony Smith | BSA | 93.82 mph | 1.12.23.8 | |
| 4 | Graham Bailey | Triumph | 89.66 mph | 1.13.12.6 | |
| 5 | Malcolm Uphill | Triumph | 80.08 mph | 1.17.07.0 | |
| 6 | Tony Godfrey | Dunstall Norton 750 Dominator | 85.92 mph | 1.19.03.2 |
12 June 1968 – 3 Laps (113.00 Miles) Mountain Course.
| Rank | Rider | Team | Speed | Time | |
|---|---|---|---|---|---|
| 1 | Ray Knight | Triumph | 90.09 mph | 1.15.23.6 | |
| 2 | John Blanchard | Velocette | 88.58 mph | 1.16.41.2 | |
| 3 | David Nixon | Triumph | 88.52 mph | 1.16.44.4 | |
| 4 | Neil Kelly | Velocette | 86.47 mph | 1.18.33.0 | |
| 5 | Graham Robinson | Honda | 85.54 mph | 1.19.24.2 | |
| 6 | George Barnacle | Triumph | 84.23 mph | 1.20.36.8 | |
| 7 | Hugh Evans | BSA | 84.47 mph | 1.23.08.6 | |
| 8 | Chas Mortimer | Ducati | 77.96 mph | 1.27.07.6 | |
| 9 | T. Walker | Triumph | 75.26 mph | 1.30.15.0 |
12 June 1968 – 3 Laps (113.00 Miles) Mountain Course.
| Rank | Rider | Team | Speed | Time | |
|---|---|---|---|---|---|
| 1 | Tervor Burgess | Ossa | 87.21 mph | 1.17.53.4 | |
| 2 | George E. Leigh | Bultaco | 85.23 mph | 1.19.41.8 | |
| 3 | Barry Smith | Suzuki | 85.17 mph | 1.19.45.0 | |
| 4 | Brian Richards | Bultaco | 83.61 mph | 1.21.14.0 | |
| 5 | Gordon Keith | Suzuki | 83.26 mph | 1.21.35.2 | |
| 6 | Tommy Robb | Suzuki | 83.03 mph | 1.21.48.0 | |
| 7 | Kel Carruthers | Suzuki | 82.10 mph | 1.23.43.8 | |
| 8 | Mike Rogers | Ducati | 80.31 mph | 1.24.38.8 | |
| 9 | Adrian T Cooper | Suzuki | 79.40 mph | 1.25.32.6 | |
| 10 | Ernie Johnson | Suzuki | 79.38 mph | 1.25.33.6 |