Club Atlético Porteño is an Argentine rugby union club sited in San Vicente, Buenos Aires. The club was founded on July 28, 1895, by Irish immigrants as a football team, which participated in tournaments organized by the Argentine Football Association until 1931 when the sport became professional in Argentina.

The 1928 Argentine Primera División was the 37th season of top-flight football in Argentina. The season began on April 15, 1928, and ended on June 30, 1929. The league expanded to include 36 teams, which played in a single league with each team playing the other only once.