Costa Rica competed at the 1984 Summer Olympics in Los Angeles, United States. The Costa Rican contingent comprised 30 competitors in 5 sports. They did not win any medals.
Athletics
- Men's 100 metres
- Glen Abrahams (7th place, Heat 10) (→ did not advance)
- Men's 200 metres
- Glen Abrahams (8th place, Heat 2) (→ did not advance)
- Men's 5000 metres
- Orlando Mora
- Heat — 14:33.49 (→ did not advance)
- Men's 10,000 metres
- Orlando Mora
- Heat — 30:49.43 (→ did not advance)
Men's Marathon
- Ronald Lanzoni — did not finish (→ no ranking)
Football
Men's Team Competition
- Preliminary Round (Group D)
- Costa Rica – United States 0 – 3
- Costa Rica – Egypt 1 – 4
- Costa Rica – Italy 1 – 0
- Quarter Finals
- → Did not advance
- Team Roster:
- ( 1.) Marco Antonio Rojas
- ( 4.) César Hines
- ( 5.) Marvin Obando
- ( 6.) German Chavarria
- ( 7.) Juan Arnoldo Cayasso
- ( 8.) Carlos Santana
- ( 9.) Leonidas Flores
- (10.) Enrique Rivers
- (11.) Evaristo Coronado
- (12.) Minor Alpizar
- (13.) Carlos Toppings
- (14.) Guillermo Guardia
- (15.) Enrique Díaz
- (16.) Álvaro Solano
- (17.) Miguel Simpson
- (18.) Luis Galagarza
- (22.) Alejandro González
Judo
- Men's extra lightweight
- Ronny Sanabria (=18th)
- Men's half-lightweight
- Andrés Sancho (=32nd)
- Men's lightweight
- Alvaro Sanabria (=19th)
- Men's half-middleweight
- Javier Condor (=34th)
Shooting
- Men's 50 metre pistol
- Mariano Lara (25th)
- Men's 10 metre air rifle
- Roger Cartín (52nd)
- Women's 10 metre air rifle
- Elizabeth Jagush (32nd)
Swimming
| Event | Athlete | Result |
|---|---|---|
| Men's 200 metre breaststroke | Andrey Aguilar | Heat 4; 2:27.69 - 29th |
| Men's 200 metre butterfly | Heat 5; 2:08.74 - 30th | |
| Men's 200 metre individual medley | Heat 1; 2:11.63 - 26th |
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