Cycling at the 2004 Summer Paralympics in Athens, consisted of 31 events in two disciplines, track cycling and road cycling. Track cycling took place at the Olympic Velodrome, and road cycling at Vouliagmeni.

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• B 1–3: Visually impaired athletes; these cyclists used tandem bicycles, with an able-bodied rider in the front seat
• LC 1–4: Lower limb and other locomotor disabilities graded by severity; unlike most Paralympic classes, higher numbers here indicate more severe conditions
• CP 1–4: Athletes with cerebral palsy or a similar disability; 1 and 2 used tricycles, 3 and 4 used bicycles
• HC A, B & C: Hand-using athletes, graded according to their degree of paraplegia or quadriplegia; these cyclists used handcycles

Track events consisted of:

• Individual pursuit
• Time trial
• Individual sprint, covering three laps of the track
• Team sprint, with teams of three

Road events consisted of endurance races and time trials. In the endurance road races, athletes with cerebral palsy cycled for a minimum of 15 kilometres, while men with visual impairment covered 120 kilometres. In the time trials, the distances were the same for each classification.

• Cycling at the 2004 Summer Olympics