See main article: 1991 Pan American Games. Swimming at the 11th Pan American Games was held August 12–18, 1991 in Havana, Cuba.[1] The competition consisted of 32 events (26 individual and 6 relay); and were contested in the long course (50m) pool.[2] [3] [4] [5]
Brazil's victory in the men's 4x100m freestyle relay was only the second time that the U.S. lost the gold in a relay event, at the Pan American Games. The first had been to Canada in women's 4x100m medley at the 1971 Pan American Games.
It was the first time that the U.S. lost the gold medal in the men's 100 meter freestyle, after 10 straight titles. This feat fitted Gustavo Borges, who went on to win four Olympic medals after this.
| 50m freestyle | 22.60 | 22.61 | 22.82 | ||||
| 100m freestyle | 49.48 GR | 50.55 | 51.25 | ||||
| 200m freestyle | 1:49.67 GR | 1:49.74 | 1:52.14 | ||||
| 400m freestyle | 3:50.38 GR | 3:54.91 | 3:58.06 | ||||
| 1500m freestyle | 15:21.36 | 15:33.61 | 15:39.73 | ||||
| 100m backstroke | 55.79 | 56.12 | 56.39 | ||||
| 200m backstroke | 2:01.07 | 2:01.14 | 2:01.68 | ||||
| 100 m breaststroke | 1:02.57 | 1:02.83 | 1:03.02 | ||||
| 200m breaststroke | 2:15.50 GR | 2:16.08 | 2:17.49 | ||||
| 100m butterfly | 53.45 GR | 54.60 | 55.00 | ||||
| 200m butterfly | 2:00.11 | 2:01.76 | 2:02.00 | ||||
| 200m I.M. | 2:00.92 GR | 2:03.99 | 2:04.29 | ||||
| 400m I.M. | 4:23.96 | 4:26.25 | 4:26.31 | ||||
| 4×100m Free Relay |  Brazil Teófilo Ferreira Emmanuel Nascimento Júlio César Rebolal Gustavo Borges | 3:23.26 |  Canada Reggie Lacoursiere Ronald Page Stephen Clarke Stephen Vandermeulen | 3:25.39 | Puerto Rico David Monasterio Jorge Herrera Manuel Guzmán Ricardo Busquets | 3:27.17 | |
| 4×200m Free Relay |  USA John Keppeler Jim Wells Clay Tippins Eric Diehl | 7:23.39 | Brazil Teófilo Ferreira Emmanuel Nascimento Cassiano Leal Gustavo Borges | 7:28.83 | Puerto Rico David Monasterio Jorge Herrera Manuel Guzmán Ricardo Busquets | 7:29.96 | |
| 4×100m Medley Relay | USA Andrew Gill Hans Dersch Mike Merrell Joel Thomas | 3:42.84 | Puerto Rico David Monasterio Jorge Herrera Todd Torres Ricardo Busquets | 3:45.78 |  Cuba Rodolfo Falcón Mario González José Ulises Hernández René Sáez | 3:45.96 | |
| 50m freestyle | 26.01 GR | 26.26 | 26.45 | ||||
| 100m freestyle | 56.51 | 57.14 | 57.63 | ||||
| 200m freestyle | 2:02.06 | 2:02.92 | 2:04.73 | ||||
| 400m freestyle | 4:13.69 | 4:16.90 | 4:22.15 | ||||
| 800m freestyle | 8:43.26 | 8:51.36 | 8:52.33 | ||||
| 100m backstroke | 1:03.15 | 1:03.64 | 1:03.78 | ||||
| 200m backstroke | 2:15.80 | 2:16.13 | 2:16.36 | ||||
| 100m breaststroke | 1:10.30 GR | 1:11.00 | 1:11.75 | ||||
| 200m breaststroke | 2:28.69 GR | 2:33.62 | 2:34.08 | ||||
| 100m butterfly | 1:01.19 | 1:01.55 | 1:01.60 | ||||
| 200 m butterfly | 2:12.35 | 2:14.55 | 2:14.91 | ||||
| 200m I.M. | 2:16.86 | 2:19.14 | 2:19.56 | ||||
| 400m I.M. | 4:50.39 | 4:51.27 | 4:52.38 | ||||
| 4×100m Freestyle Relay | USA Megan Oesting Suzy Buckovich Lisa Jacob Ashley Tappin | 3:48.88 | Canada Sharon Turner Kristin Topham Joanne Malar Kimberly Paton | 3:52.29 | Brazil Isabelle Vieira Paula Marsiglia Paula Renata Aguiar Paoletti Filippini | 3:52.92 | |
| 4×200m Freestyle Relay | USA Natalie Norberg Barbara Metz Jane Skillman Lisa Jacob | 8:11.47 GR | Canada Kimberly Paton Joanne Malar Nikki Dryden Tara-Lynn Seymour | 8:21.62 |  Mexico Lorenza Muñoz Susana Goldschmied Gabriela Gajá Laura Sánchez | 8:29.17 | |
| 4×100m Medley Relay | USA Jodi Wilson Dorsey Tierney Angie Wester-Krieg Ashley Tappin | 4:12.51 GR | Brazil Ana Azevedo Glicia Lofego Paoletti Filippini Celina Endo | 4:23.45 | Mexico Heike Koerner Monique Piñon Gabriela Gaja Laura Sánchez | 4:25.94 | |