Eduardo "Edu" Oncins (born 10 December 1964) is a Brazilian former professional tennis player.

Oncins, who comes from São Paulo, represented Brazil in a Davis Cup tie against Ecuador in 1982.

[1] During his career he twice qualified for the singles main draw of a grand slam tournament, at the 1983 Australian Open and 1984 French Open.

His younger brother, Jaime Oncins, played on the professional tour in the 1990s.

[2]