2009 World Championships in Athletics – Women's 4 × 100 metres relay
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Events at the 2009 World Championships 
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|---|---|---|---|---|
| Track events | ||||
| 100 m | men | women | ||
| 200 m | men | women | ||
| 400 m | men | women | ||
| 800 m | men | women | ||
| 1500 m | men | women | ||
| 5000 m | men | women | ||
| 10,000 m | men | women | ||
| 100 m hurdles | women | |||
| 110 m hurdles | men | |||
| 400 m hurdles | men | women | ||
| 3000 m steeplechase |
men | women | ||
| 4×100 m relay | men | women | ||
| 4×400 m relay | men | women | ||
| Road events | ||||
| Marathon | men | women | ||
| 20 km walk | men | women | ||
| 50 km walk | men | |||
| Field events | ||||
| Long jump | men | women | ||
| Triple jump | men | women | ||
| High jump | men | women | ||
| Pole vault | men | women | ||
| Shot put | men | women | ||
| Discus throw | men | women | ||
| Javelin throw | men | women | ||
| Hammer throw | men | women | ||
| Combined events | ||||
| Heptathlon | women | |||
| Decathlon | men | |||
The women's 4 x 100 metres relay at the 2009 World Championships in Athletics was held at the Olympic Stadium on August 21 and August 22.
Prior to the competition, the following records were as follows.
No new world or championship record was set during this competition.
The first 2 of each heat (Q) plus the 2 fastest times (q) qualify.
Key: DNF = Did not finish, DNS = Did not start, NR = National record, Q = qualification by place in heat, q = qualification by overall place, SB = Seasonal best
Key: SB = Seasonal best
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