The men's 20 kilometres walk at the 2008 Summer Olympics took place on 16 August at the Beijing National Stadium.

[1] The qualifying standards were 1:23:00 (A standard) and 1:24:30 (B standard).

[2] Prior to this competition, the existing world and Olympic records were as follows: No new world or Olympic records were set for this event.

PB = Personal Best, SB = Season Best s.t.

- same time.