Mexico competed at the 1984 Summer Olympics in Los Angeles, United States. 99 competitors, 77 men and 22 women, took part in 87 events in 18 sports.
Medalists
{| class="wikitable sortable" style="font-size:90%"
|-
!Medal
!Name
!Sport
!Event
!Date
|-
| || || Athletics || Men's 20 kilometres walk || 3 August
|-
| || || Athletics || Men's 50 kilometres walk || 11 August
|-
| || || Wrestling || Men's Greco-Roman 52 kg || 2 August
|-
| || || Athletics || Men's 20 kilometres walk || 3 August
|-
| || || Boxing || Men's bantamweight || 11 August
|-
| || || Cycling || Men's points race || 3 August
|}
Archery
In its second Olympic archery competition, Mexico entered one man and one woman. Aurora Breton, a veteran of Mexico's first appearance in the 1972 archery competition, took ninth place.
Women's Individual Competition:
- Aurora Bretón — 2481 points (→ 9th place)
Men's Individual Competition:
- Adolfo González — 2418 points (→ 33rd place)
Athletics
Men's 5,000 metres
- Gerardo Alcala
:* Heat — 13:50.60
:* Semifinals — 13:45.98 (→ did not advance)
- Eduardo Castro
:* Heat — 13:51.46
:* Semifinals — 13:42.04 (→ did not advance)
Men's 10,000 metres
- José Gómez
:* Qualifying Heat — 28:28.50 (→ did not advance)
- Martín Pitayo
:* Qualifying Heat — 28:59.19 (→ did not advance)
Men's Marathon
- Jesús Herrera — 2:20:33 (→ 36th place)
- Rodolfo Gómez — did not finish (→ no ranking)
- Miguel Angel Cruz — did not finish (→ no ranking)
Men's Javelin Throw
- Juan de la Garza
:* Qualification — 79.16m (→ did not advance, 14th place)
Men's 20 km Walk
- Ernesto Canto
:* Final — 1:23:13 (→ 16x16px Gold Medal)
- Raúl González
:* Final — 1:23:20 (→ 16x16px Silver Medal)
- Marcelino Colín
:* Final — 1:28:26 (→ 17th place)
Men's 50 km Walk
- Raúl González
:* Final — 3:47:26 (→ 16x16px Gold Medal)
- Ernesto Canto
:* Final — 4:07:59 (→ 10th place)
- Martín Bermúdez
:* Final — DSQ (→ no ranking)
<br>
Women's Marathon
- María Trujillo
:* Final — 2:38:50 (→ 25th place)
- Maria Cardenas
:* Final — 2:51:03 (→ 40th place)
- Maria Luisa Ronquillo
:* Final — 2:51:04 (→ 41st place)
Women's 400m Hurdles
- Alma Vázquez
:* Heat — 1:00.86 (→ did not advance)
Boxing
Men's Flyweight
- Fausto García
Men's Bantamweight (54 kg)
- Héctor López → Image:Med 2.png Silver Medal
:* First Round — Bye
:* Second Round — Defeated Johnny Assadoma (INA), KO-3
:* Third Round — Defeated Joe Orewa (NGR), 4:1
:* Quarterfinals — Defeated Ndaba Dube (ZIM), 5:0
:* Semifinals — Defeated Dale Walters (CAN), 5:0
:* Final — Lost to Maurizio Stecca (ITA), 1:4
Men's Featherweight
- Javier Camacho
Men's Lightweight
- Luciano Solis
Men's Light-Welterweight
- Octavio Robles
Men's Welterweight
- Genaro Léon
Canoeing
Cycling
Eight cyclists represented Mexico in 1984.
;Individual road race
- Raúl Alcalá — +1:43 (→ 11th place)
- Luis Ramos — +6:14 (→ 17th place)
- Salvador Rios — +22:20 (→ 47th place)
- Jesús Rios — did not finish (→ no ranking)
;Team time trial
- Raúl Alcalá
- Félipe Enríquez
- Guillermo Gutiérrez
- Cuauthémoc Muñoz
;Points race
- José Youshimatz
:* Final — 29 points (→ Image:Med 3.png Bronze Medal)
Diving
Men's 3m Springboard
- Jorge Mondragón
:* Preliminary Round — 537.03
:* Final — 550.35 (→ 9th place)
- Carlos Girón
:* Preliminary Round — 549.75
:* Final — 530.04 (→ 12th place)
Equestrianism
Fencing
One female fencer represented Mexico in 1984.
;Women's foil
- Lourdes Lozano
Gymnastics
Judo
Modern pentathlon
Three male pentathletes represented Mexico in 1984.
;Individual
- Ivar Sisniega
- Alejandro Yrizar
- Marcelo Hoyo
;Team
- Ivar Sisniega
- Alejandro Yrizar
- Marcelo Hoyo
Rowing
Sailing
Shooting
- 25 metres rapid-fire pistol, men - Mario Sánchez (=26th place)
- 10 metres air rifle, men - José Álvarez (=36th place); Víctor Garcés (46th place)
- 50 metres rifle three positions, men - José Álvarez (=30th place); Víctor Garcés (38th place)
- 50 metres rifle prone, men - Víctor Garcés (9th place); José Álvarez (41st place)
- Trap, open - Diego García (=17th place); Guillermo Castellanos (=41st place)
- Skeet, open - Nuria Ortiz (9th place); Ángel Guzmán (46th place)
- 25 metres pistol, women - Mónica Patron (29th place)
Swimming
Men's 100m Freestyle
- Ramiro Estrada
:* Heat — 52.07 (→ did not advance, 23rd place)
- César Sánchez
:* Heat — 54.94 (→ did not advance, 48th place)
Men's 200m Freestyle
- César Sánchez
:* Heat — 1:55.82 (→ did not advance, 31st place)
- Carlos Romo
:* Heat — 1:58.77 (→ did not advance, 42nd place)
Men's 100m Backstroke
- Ernesto Vela
:* Heat — 1:01.42 (→ did not advance, 32nd place)
Men's 200m Backstroke
- Ernesto Vela
:* Heat — 2:10.30 (→ did not advance, 26th place)
Men's 100m Breaststroke
- Eduardo Morillo
:* Heat — 1:06.82 (→ did not advance, 31st place)
Men's 200m Breaststroke
- Eduardo Morillo
:* Heat — 2:23.72 (→ did not advance, 20th place)
Men's 100m Butterfly
- Carlos Romo
:* Heat — 57.61 (→ did not advance, 32nd place)
Men's 200m Individual Medley
- Eduardo Morillo
:* Heat — 2:09.87 (→ did not advance, 23rd place)
Men's 4 × 100 m Freestyle Relay
- José Medina, Ramiro Estrada, César Sánchez, and Carlos Romo
:* Heat — 3:33.86 (→ did not advance, 16th place)
Men's 4 × 100 m Medley Relay
- Ernesto Vela, Eduardo Morillo, Carlos Romo, and Ramiro Estrada
:* Heat — 3:56.11 (→ did not advance, 14th place)
<br>
Women's 100m Freestyle
- Patricia Kohlmann
:* Heat — 58.76 (→ did not advance, 20th place)
- Teresa Rivera
:* Heat — 59.61 (→ did not advance, 25th place)
Women's 200m Freestyle
- Patricia Kohlmann
:* Heat — 2:07.75 (→ did not advance, 21st place)
- Irma Huerta
:* Heat — 2:09.52 (→ did not advance, 24th place)
Women's 400m Freestyle
- Irma Huerta
:* Heat — 4:25.13
:* B-Final — 4:23.34 (→ 16th place)
Women's 800m Freestyle
- Irma Huerta
:* Heat — 8:56.18 (→ did not advance, 12th place)
- Rosa Fuentes
:* Heat — DNS (→ did not advance, no ranking)
Women's 100m Backstroke
- Teresa Rivera
:* Heat — 1:06.39 (→ did not advance, 21st place)
Women's 200m Backstroke
- Teresa Rivera
:* Heat — 2:22.94 (→ did not advance, 20th place)
Women's 4 × 100 m Freestyle Relay
- Patricia Kohlmann, Teresa Rivera, Rosa Fuentes, and Irma Huerta
:* Heat — 3:58.31 (→ did not advance)
Women's 4 × 100 m Medley Relay
- Teresa Rivera, Sara Guido, Maria Urbina, and Patricia Kohlmann
:* Heat — DSQ (→ did not advance)
Synchronized swimming
Women's Solo
- Pilar Ramírez
- Claudia Novelo
- Lourdes Candini
Women's Duet
- Claudia Novelo and Pilar Ramírez