Swimming at the 2011 World Aquatics Championships – Women's 50 metre butterfly

The women's 50 metre butterfly competition of the swimming events at the 2011 World Aquatics Championships was held on July 29 with the heats and the semifinals and July 30 with the final.

Records
Prior to the competition, the existing world and championship records were as follows.

Heats
51 swimmers participated in 7 heats.

Semifinals
The semifinals were held at 18:19.

Final
The final was held at 18:02.