Medalists
| Gold | Silver | Bronze |
Daynara de Paula  Brazil | Daniele Jesus Brazil | Jeserik Pinto  Venezuela |
The Women's 50m butterfly event at the 2010 South American Games was held on March 27, with the heats at 10:00 and the Final at 18:00.
| Gold | Silver | Bronze |
| Daynara de Paula Brazil | Daniele Jesus Brazil | Jeserik Pinto Venezuela |
| Standing records prior to the 2010 South American Games | ||||
|---|---|---|---|---|
| World record |  Therese Alshammar (SWE) | 25.07 | Rome, Italy | 31 July 2009 |
| Competition Record | Gabriella Silva (BRA) | 27.95 | Buenos Aires, Argentina | 16 November 2006 |
| South American record | Daynara de Paula (BRA) | 25.85 | Rome, Italy | 31 July 2009 |
| Rank | Heat | Lane | Athlete | Result | Notes |
|---|---|---|---|---|---|
| 1 | 3 | 4 | Daynara de Paula (BRA) | 27.21 | Q CR |
| 2 | 2 | 4 | Daniele Jesus (BRA) | 27.91 | Q |
| 3 | 3 | 6 | Jeserik Pinto (VEN) | 28.17 | Q |
| 4 | 2 | 5 |  María Clara Sosa (COL) | 28.62 | Q |
| 5 | 1 | 4 |  Loren Yamile Cabello (ECU) | 28.77 | Q |
| 6 | 1 | 5 |  Manuela Morano (ARG) | 28.88 | Q |
| 7 | 1 | 3 | Ayelen Becker (ARG) | 28.98 | Q |
| 7 | 2 | 3 | Elimar Barrios (VEN) | 28.98 | Q |
| 9 | 1 | 6 | Ximena Espinol (ECU) | 29.85 | |
| 10 | 2 | 6 |  Raissa Andrea Guerra (URU) | 29.94 | |
| 11 | 2 | 2 |  Maria Wong Rosales (PER) | 30.18 | |
| 12 | 1 | 2 |  Nilshaira Isenia (AHO) | 30.19 | |
| 13 | 3 | 2 |  Karen Torrez Guzman (BOL) | 30.28 | |
| 14 | 3 | 7 | Massie Carrillo Yong (PER) | 31.16 | |
| 15 | 2 | 7 |  Josefina Meneses (CHI) | 31.48 | |
| 3 | 3 | Eliana Barrios (VEN) | DNS | ||
| 3 | 5 | Carolina Colorado Henao (COL) | DSQ | ||
| Rank | Lane | Athlete | Result | Notes |
|---|---|---|---|---|
 | 4 | Daynara de Paula (BRA) | 26.77 | CR |
 | 5 | Daniele Jesus (BRA) | 27.35 | |
 | 3 | Jeserik Pinto (VEN) | 27.58 | |
| 4 | 6 | Loren Yamile Cabello (ECU) | 28.05 | |
| 5 | 6 | María Clara Sosa (COL) | 28.46 | |
| 6 | 1 | Ayelen Becker (ARG) | 28.73 | |
| 7 | 7 | Manuela Morano (ARG) | 28.92 | |
| 8 | 8 | Elimar Barrios (VEN) | 28.99 | |
Norway was represented at the 1972 Summer Olympics in Munich by the Norwegian Olympic Committee and Confederation of Sports. 112 competitors, 101 men and 11 women, took part in 70 events in 15 sports.
Japan competed at the 2000 Summer Olympics in Sydney, Australia. 266 competitors, 156 men and 110 women, took part in 156 events in 28 sports.
Hungary competed at the 2000 Summer Olympics in Sydney, Australia. 178 competitors, 109 men and 69 women, took part in 137 events in 23 sports.
Spain competed at the 2000 Summer Olympics in Sydney, Australia. 321 competitors, 216 men and 105 women, took part in 165 events in 27 sports.
Canada competed at the 2000 Summer Olympics in Sydney, Australia, held from 15 September to 1 October 2000. 294 competitors, 150 men, and 144 women, took part in 175 events in 29 sports.
The Soviet Union (USSR) competed, for the last time before its dissolution, at the 1988 Summer Olympics in Seoul. 481 competitors, 319 men and 162 women, took part in 221 events in 27 sports. Athletes from 12 of the ex-Soviet republics would compete as the Unified Team at the 1992 Summer Olympics, and each nation would field independent teams in subsequent Games.
The Netherlands competed at the 1988 Summer Olympics in Seoul, Republic of Korea. 147 competitors, 93 men and 54 women, took part in 86 events in 17 sports.
Great Britain, represented by the British Olympic Association (BOA), competed at the 1988 Summer Olympics in Seoul, South Korea. 345 competitors, 219 men and 126 women, took part in 191 events in 22 sports. British athletes have competed in every Summer Olympic Games.
Italy competed at the 1988 Summer Olympics in Seoul, South Korea. 253 competitors, 212 men and 41 women, took part in 140 events in 23 sports.
Belgium competed at the 1988 Summer Olympics in Seoul, South Korea. 59 competitors, 35 men and 24 women, took part in 65 events in 16 sports.
Switzerland competed at the 1988 Summer Olympics in Seoul, South Korea. 99 competitors, 72 men and 27 women, took part in 83 events in 17 sports.
The Unified Team at the 1992 Summer Olympics in Barcelona, Spain, was a joint team consisting of twelve of the fifteen former Soviet republics that chose to compete together. The previously Soviet-occupied states of Estonia, Latvia, and Lithuania competed separately. The team has been informally called the Commonwealth of Independent States team, though Georgia was not yet a member of the CIS when it competed as part of the Unified Team. It competed under the IOC country code EUN. A total of 475 competitors, 310 men and 165 women, took part in 234 events in 27 sports.
Japan competed at the 1992 Summer Olympics in Barcelona, Spain. 256 competitors, 175 men and 81 women, took part in 166 events in 24 sports.
Hungary competed at the 1992 Summer Olympics in Barcelona, Spain. 217 competitors, 159 men and 58 women, took part in 156 events in 23 sports.
Japan competed at the 1996 Summer Olympics in Atlanta, United States. 306 competitors, 157 men and 149 women, took part in 168 events in 27 sports.
The Netherlands competed at the 1972 Summer Olympics in Munich, West Germany. 119 competitors, 90 men and 29 women, took part in 72 events in 16 sports.
Athletes from East Germany competed at the 1980 Summer Olympics in Moscow, USSR. 346 competitors, 222 men and 124 women, took part in 167 events in 17 sports.
Athletes from East Germany competed at the Olympic Games for the last time as an independent nation at the 1988 Summer Olympics in Seoul, South Korea. Following German reunification in 1990, a single German team would compete in the 1992 Summer Olympics. 259 competitors, 157 men and 102 women, took part in 157 events in 16 sports. The team was officially announced on 3 September 1988.
Romania competed at the 1992 Summer Olympics in Barcelona, Spain. It was the first Summer Games for the nation after the fall of Communism in 1989. 172 competitors, 104 men and 68 women, took part in 128 events in 18 sports.
Denmark competed at the 1996 Summer Olympics in Atlanta, United States. 119 competitors, 54 men and 65 women, took part in 66 events in 14 sports.