- Source: 1999 Isle of Man TT
- Isle of Man TT
- Daftar Sirkuit Grand Prix Sepeda Motor
- Grand Prix Sepeda Motor Britania
- Grand Prix Sepeda Motor musim 1962
- Grand Prix Sepeda Motor
- John Surtees
- Mondial piega
- Kejuaraan Dunia Supersport
- Daftar perlombaan Grand Prix Sepeda Motor
- ISO 3166-1
- Isle of Man TT
- 1999 Isle of Man TT
- List of Isle of Man TT Mountain Course fatalities
- Isle of Man TT Mountain Course
- 1976 Isle of Man TT
- 1977 Isle of Man TT
- 1998 Isle of Man TT
- Kate's Cottage, Isle of Man
- Audi TT
- Senior TT
The 1999 Isle of Man TT was the 93rd edition of the event. David Jefferies won three TTs during the event, including the marquee Senior TT race, more than anyone that year. Jim Moodie broke the outright lap record on lap one during the Senior TT, with a 124.45 mph (200.28 km/h) average, but he had to retire due to a shredded tyre on lap two.
The first race of the event, the Formula One TT, was red flagged on lap one after the TT career ending accident of Paul Orritt at Bray Hill. It was later restarted and won by Jefferies.
The sidecar honours were shared by Dave Molyneux and Rob Fisher, with Molyneux taking a new sidecar lap record in race one.
1998 Formula One TT and Senior TT winner Ian Simpson was not able to take part in the event due to leg injuries.
The event was marred by the death of four competitors: sidecar passengers Bernadette Bosman and Terry Fenton, and solo class riders Simon Beck and Stuart Murdoch. Beck was a podium finisher at the 1997 Isle of Man TT.
Results
= Formula One TT
== Sidecar Race A
== Sidecar Race B
== Junior 600cc TT
== Singles TT
== Lightweight 250 TT
== Lightweight 400 TT
=Held simultaneously with the Lightweight 250 TT. Geoff McMullan and Nick Jefferies are tied for third place.