The Women's 4x100 metre relay event at the 2008 Olympic Games took place on 21 and 22 August at the Beijing Olympic Stadium. There were 16 NOCs competing at this event. These 16 NOCs were selected by the average of the two best marks at the qualifying period. Finland and Cuba were qualified but withdrew and were replaced by Thailand and Nigeria. Participation only at Round 1. Prior to this competition, the existing world and Olympic records were as follows. No new world or Olympic records were set for this event. All times shown are in seconds. First 3 in each heat and the next 2 fastest advance to the Final.
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August 21, 2008 - August 22, 2008
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