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.