Swimming at the 2011 Pan American Games – Women's 100 metre freestyle
The Women's 100 metre freestyle swimming event at the 2011 Pan American Games was held on October 19, 2011 in Guadalajara, Mexico. The defending Pan American Games champion was Arlene Semeco of Venezuela. This race consisted of two lengths of the pool, both in freestyle. Records. Prior to this competition, the existing world and Pan American Games records were as follows: Qualification. Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (57.6) in the qualifying period  (January 1, 2010 to September 4, 2011). NOCs were also permitted to enter one athlete providing they had met the B standard (59.3) in the same qualifying period. Results. All times are in minutes and seconds. Heats. The first round was held on October 19. B Final. The B final was also held on October 19. A Final. The A final was also held on October 19.