Marieta Riera (born 23 December 1963) is a retired Venezuelan track and field athlete who competed in the women's javelin throw competition during her career.
| Year | Competition | Venue | Position | Notes |
|---|---|---|---|---|
| 1982 | Central American and Caribbean Games | Havana, Cuba | 3rd | Javelin |
| 1983 | South American Championships | Santa Fe, Argentina | 1st | Javelin |
| Pan American Games | Caracas, Venezuela | 3rd | Javelin | |
| 1987 | Central American and Caribbean Championships | Caracas, Venezuela | 2nd | Javelin |
| Pan American Games | Indianapolis, United States | 3rd | Javelin | |
| 1989 | South American Championships | Medellín, Colombia | 2nd | Javelin |
| 1990 | Central American and Caribbean Games | Mexico City, Mexico | 3rd | Javelin |
| 1991 | South American Championships | Manaus, Brazil | 1st | Javelin |