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.^[1]

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)

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 (→ Gold Medal)

• Raúl González

• Final — 1:23:20 (→ Silver Medal)

• Marcelino Colín

• Final — 1:28:26 (→ 17th place)

Men's 50 km Walk

• Raúl González

• Final — 3:47:26 (→ Gold Medal)

• Ernesto Canto

• Final — 4:07:59 (→ 10th place)

• Martín Bermúdez

• Final — DSQ (→ no ranking)

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)

Men's Flyweight

• Fausto García

Men's Bantamweight (54 kg)

• Héctor López → 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

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 (→ Bronze Medal)

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)

One female fencer represented Mexico in 1984.

Women's foil

• Lourdes Lozano

Three male pentathletes represented Mexico in 1984.

Individual

• Ivar Sisniega
• Alejandro Yrizar
• Marcelo Hoyo

Team

• Ivar Sisniega
• Alejandro Yrizar
• Marcelo Hoyo

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)

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)

Women's Solo

• Pilar Ramírez
• Claudia Novelo
• Lourdes Candini

Women's Duet

• Claudia Novelo and Pilar Ramírez