2009 World Championships in Athletics – Women's 4 × 100 metres relay

The women's 4 × 100 metres relay at the 2009 World Championships in Athletics was held at the Olympic Stadium on August 21 and August 22.

Records
Prior to the competition, the following records were as follows.

No new world or championship record was set during this competition.

Heats
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

Final
Key: SB = Seasonal best