Rubén Humberto Aguiar (born July 21, 1956) is a retired male marathon runner from Argentina, who won the first edition of the Buenos Aires Marathon in 1984. He represented his native country in the men's marathon at the 1984 Summer Olympics in Los Angeles, California.
| Representing | |||||
|---|---|---|---|---|---|
| 1984 | Buenos Aires, Argentina | 1st | 2:21:27 | ||
| Los Angeles, United States | 59th | ||||
| 1988 | Mar del Plata, Argentina | 1st | 2:23:54 | ||