The 1991 South American Under-17 Football Championship (, ) was the fourth edition of the South American Under-17 Football Championship, a football competition for the under-17 national teams in South America organized by CONMEBOL. It was held in Paraguay from 4 to 19 May 1991.
Brazil were crowned champions, and together with Argentina and Uruguay, which were the top three teams of this tournament, qualified for the 1991 FIFA U-17 World Championship in Italy.
The referees were:
The main venue was Estadio Defensores del Chaco, Asunción with some games being played at Estadio Manuel Ferreira and Estadio General Pablo Rojas in the same city. Estadio Juan Canuto Pettengill, Itauguá and Estadio Feliciano Cáceres, Luque were also used.
The top two teams in each group advanced to the final stage.
When teams finished level of points, the final rankings were determined according to:
All times local, PAT ().
When teams finished level of points, the final rankings were determined according to the same criteria as the first stage, taking into account only matches in the final stage.
The following three teams from CONMEBOL qualified for the 1991 FIFA U-17 World Championship.