The 2004 Isle of Man TT was the 97th edition of the event. John McGuinness won three TT races, more than anyone that year. Dave Molyneux and Daniel Sayle took the two sidecar races, while Adrian Archibald won the marquee Senior TT. ^[1]

The event marked the last TT race for 125cc bikes on the Mountain Course. ^[2]

Three competitors died during the event: 125cc rider Serge Le Moal and sidecar passenger Paul Cowley during practice, ^{[3] [4]} and Colin Breeze during the Formula One TT race. ^[5]

Results

^{[6] [7]}

Race 1 – Formula One TT

Rank	Number	Rider	Machine	Time	Speed (mph)
1	3	John McGuinness	Yamaha	1 12 13.2	125.38
2	1	Adrian Archibald	Suzuki	1 12 31.8	124.84
3	5	Bruce Anstey	Suzuki	1 12 58.0	124.10
4	4	Jason Griffiths	Yamaha	1 13 20.3	123.47
5	2	Ian Lougher	Honda	1 13 27.7	123.26
6	8	Richard Britton	Suzuki	1 13 53.1	122.55

Race 2 – Sidecar Race A

Rank	Number	Rider	Passenger	Machine	Time	Speed (mph)
1	1	Dave Molyneux	Daniel Sayle	DRM Honda	1 01 00.0	111.33
2	3	Nick Crowe	Darren Hope	DRM Honda	1 01 59.0	109.56
3	5	Steve Norbury	Scott Parnell	Shelbourne Yamaha	1 02 51.8	108.03
4	4	Roy Hanks	Dave Wells	DMR Yamaha	1 03 02.5	107.72
5	15	Greg Lambert	Ivan Murray	DMR Honda	1 03 23.4	107.13
6	8	Philip Dongworth	Stuart Castles	Ireson Kawasaki	1 03 44.8	106.53

Race 3 – Lightweight 400cc

Rank	Number	Rider	Machine	Time	Speed (mph)
1	41	John McGuinness	Honda	1 22 06.4	110.28
2	47	Steve Linsdell	Yamaha	1 22 39.6	109.54
3	49	Mark Parrett	Honda	1 22 42.4	109.48
4	67	Roy Richardson	Honda	1 23 02.0	109.05
5	45	Johnny Barton	Yamaha	1 23 44.8	108.12
6	48	Derran Slous	Yamaha	1 24 04.7	107.69

Race 4 – Ultralightweight 125cc

Rank	Number	Rider	Machine	Time	Speed (mph)
1	1	Chris Palmer	Honda	1 23 07.6	108.93
2	4	Robert Dunlop	Honda	1 24 05.5	107.68
3	7	Nigel Beattie	Honda	1 25 56.4	105.36
4	6	Garry Bennett	Honda	1 26 05.1	105.18
5	16	Matt Jackson	Honda	1 26 20.6	104.87
6	10	Mark Tyrrell	Honda	1 26 47.2	104.33

Race 5 - International Production 1000

Rank	Number	Rider	Machine	Time	Speed (mph)
1	5	Bruce Anstey	Suzuki	54 53.5	123.72
2	3	John McGuinness	Yamaha	55 11.5	123.05
3	4	Jason Griffiths	Yamaha	55 17.3	122.83
4	2	Ian Lougher	Honda	55 22.7	122.63
5	1	Adrian Archibald	Suzuki	55 49.5	121.65
6	8	Richard Britton	Suzuki	56 24.5	120.39

Race 6 - Junior 600cc

Rank	Number	Rider	Machine	Time	Speed (mph)
1	3	John McGuinness	Yamaha	1 15 06.0	120.57
2	5	Bruce Anstey	Suzuki	1 15 23.0	120.12
3	4	Jason Griffiths	Yamaha	1 15 45.6	119.52
4	8	Richard Britton	Honda	1 16 10.8	118.86
5	10	Mark Parrett	Yamaha	1 16 27.3	118.43
6	12	Martin Finnegan	Yamaha	1 16 53.9	117.75

Race 7 - Sidecar Race B

Rank	Number	Rider	Passenger	Machine	Time	Speed (mph)
1	1	Dave Molyneux	Daniel Sayle	DRM Honda	1 01 04.2	111.20
2	3	Nick Crowe	Darren Hope	DRM Honda	1 01 41.6	110.08
3	5	Steve Norbury	Scott Parnell	Shelbourne Yamaha	1 02 22.3	108.88
4	4	Roy Hanks	Dave Wells	DRM Honda	1 02 32.7	108.58
5	6	Gary Bryan	Steven Hedison	Baker Yamaha	1 03 04.9	107.66
6	15	Greg Lambert	Ivan Murray	DRM Honda	1 03 11.0	107.48

Race 8 - Production 600

Rank	Number	Rider	Machine	Time	Speed (mph)
1	6	Ryan Farquhar	Kawasaki	57 46.6	117.54
2	5	Bruce Anstey	Suzuki	57 48.9	117.46
3	3	John McGuinness	Yamaha	57 57.9	117.16
4	4	Jason Griffiths	Yamaha	58 07.9	116.82
5	2	Ian Lougher	Honda	58 21.1	116.38
6	7	Raymond Porter	Suzuki	58 44.0	115.63

Race 9 - Senior TT

Rank	Number	Rider	Machine	Time	Speed (mph)
1	1	Adrian Archibald	Suzuki	1 13 08.1	123.81
2	5	Bruce Anstey	Suzuki	1 13 38.3	122.96
3	14	Gary Carswell	Suzuki	1 15 03.3	120.64
4	10	Mark Parrett	Yamaha	1 15 09.9	120.47
5	12	Martin Finnegan	Yamaha	1 15 10.7	120.44
6	9	Chris Heath	Honda	1 15 22.1	120.14

Notes