The 1969 Isle of Man TT, the fourth round of the 1969 Grand Prix motorcycle racing season, involved a number of races on the Mountain Course on the Isle of Man. For the second year running Giacomo Agostini won both the Junior and Senior races, completing the six laps of the latter race in 2:09.40.2 to win by almost nine minutes. There were three "production" categories; Malcolm Uphill won the 750 cc, Graham Penny the 500 cc and Mike Rogers the 250 cc. German pairs won both sidecar events; Klaus Enders and Ralf Engelhardt in the 500 cc and Siegfried Schauzu and H.Schneider in the 750 cc. Kel Carruthers won the Lightweight 250 cc race, while Dave Simmonds won the Lightweight 125 cc.