The Women's Hammer Throw event at the 2009 World Championships in Athletics was held at the Olympic Stadium on August 20 and August 22.
Prior to the competition, the existing records were as follows.
The following records were set during this competition.
Qualification: Qualifying Performance 72.00 (Q) or at least 12 best performers (q) advance to the final.
Key: NM = no mark (i.e. no valid result), Q = qualification by place in heat, q = qualification by overall place
Key: NR = National record, PB = Personal best, WR = World record