Omar Ruben Larrosa (born 18 November 1947 in Lanús, Buenos Aires) is a retired Argentine footballer, who played as a midfielder, and the current assistant coach at Boca Juniors.

In the 1970 season Larrosa won his first trophy although he didn't actually play in the final of the Nacional against Rosario Central.

The following season he traveled to Central America to join Guatemalan champions CSD Comunicaciones, and was a symbol on this club that is the best in the area.

After Larrosa left Independiente in 1980 he had a short spell with Vélez Sársfield before joining San Lorenzo.

[3] The 1981 season progressed disastrously for San Lorenzo, ending with the club relegated from the Primera for the first time in their history, this catastrophe prompted Larrosa's retirement from football at the age of 34.