César Mercado (born October 25, 1959) is a retired Puerto Rican marathon runner. He competed for his native country in the men's marathon at the 1984 Summer Olympics, finishing in 31st place. He set is personal best in the classis distance (2:17.31) in 1982.
| Year | Competition | Venue | Position | Event | Notes |
|---|---|---|---|---|---|
| Representing Puerto Rico | |||||
| 1983 | Pan American Games | Caracas, Venezuela | 2nd | Marathon | 2:20:30 |
| 1984 | Olympic Games | Los Angeles, United States | 31st | Marathon | 2:19:09 |
| 1989 | Central American and Caribbean Championships | San Juan, Puerto Rico | 2nd | Half Marathon | 1:08:38 |
| 1990 | Central American and Caribbean Games | Mexico City, Mexico | 2nd | Marathon | 2:18:59 |