Portugal competed at the 1984 Summer Olympics in Los Angeles, United States.
A delegation of thirty eight competitors participated in eleven sports, bringing home a total of three medals – a feat only repeated 20 years later, in Athens – including Portugal's first ever Olympic gold medal, through Carlos Lopes in the marathon. Rosa Mota, future marathon olympic champion, was the bronze medalist of this event, who appeared for the first time in the Olympics.
Portugal made its debut in the Olympic archery as well as in the diving, with Joana Figueiredo as the first Portuguese Olympic diver. Female competitors were also present at the first rhythmic gymnastics events in an Olympiad.
Medalists
Archery
Men's Competition: Rui Santos — 2324 pts (→ 51st) { |class=wikitable style="text-align:center;" !Distance!!90m!!70m!!50m!!30m!!Total |- !Round 1 |248||287||304||334||1173 |- !Round 2 |240||290||291||330||1151 |- !Total |488||577||595||664||2324 |}
Athletics
Men's Events
100m: Luís Barroso Round 1 (heat 8) — 10.76 (→ 4th, did not advance)
200m: Luís Barroso Round 1 (heat 7) — 22.03 (→ 6th, did not advance)
5,000m: Ezequiel Canário Round 1 (heat 1) — 13:43.28 (→ 1st) Semi-final (heat 2) — 13:32.64 (→ 9th, advanced as 3rd fastest loser) Final — 13:26.50 (→ 9th)
João Campos
Round 1 (heat 3) — 13:46.27 (→ 5th) Semi-final (heat 2) — 13:34.46 (→ 10th, did not advance)
António Leitão
Round 1 (heat 4) — 13:51.33 (→ 1st) Semi-final (heat 1) — 13:39.76 (→ 2nd) Final — 13:09.20 (→ Bronze Medal)
10,000m: Fernando Mamede Round 1 (heat 1) — 28:21.87 (→ 1st) Final — did not finish
Marathon: Carlos Lopes — 2:09:21 OR (→ Gold Medal) Cidálio Caetano — did not finish Delfim Moreira — did not finish
20 km Walk: José Pinto — 1:30:57 (→ 25th)
50 km Walk: José Pinto — 4:04:42 (→ 8th)
Women's Events
800m: Maria Machado Round 1 (heat 4) — 2:05.74 (→ 5th, did not advance)
3000m: Aurora Cunha Round 1 (heat 1) — 8:46.38 (→ 4th, advanced as 2nd fastest loser) Final — 8:46.37 (→ 6th)
Maria Machado
Round 1 (heat 2) — 9:01.77 (→ 4th, did not advance)
Rosa Mota
Round 1 (heat 3) — did not finish
Marathon: Conceição Ferreira — 2:50:58 (→ 39th) Rita Borralho — 2:50:58 (→ 38th) Rosa Mota — 2:26:57 (→ Bronze Medal)
Diving
Women's 3m Springboard: Joana Figueiredo Preliminary — 374,07 pts (→ 22nd, did not advance) { | class="wikitable" style="text-align:center;" |- !Dive!!1!!2!!3!!4!!5!!6!!7!!8!!9!!10!!rowspan=2|Total |- !Coef. |1.5||1.9||2.0||1.7||2.4||2.4||2.8||2.8||2.1||2.5 |- !Pts |32,40||35,34||40,80||35,15||43,92||46,80||24,36||27,72||41,58||48,00||374,07 |}
Fencing
One fencer represented Portugal in 1984
Men's sabre
João Marquilhas — 31st
Round 1 (Pool C) — 5 matches, 0 victories (→ 6th, did not advance) Jorg Stratmann (FRG) (→ lost 5:4) John Zarno (GBR) (→ lost 5:3) Michael Lofton (USA) (→ lost 5:4) Ruiji Wang (CHN) (→ lost 5:2) Jean François Lamour (FRA) (→ lost 5:3)
Gymnastics
Individual All-Round Competition: Margarida Carmo — 54,575 pts (→ 18th) { |class=wikitable style="text-align:center;" !Hoop!!Ball!!Clubs!!Ribbon!!Results!!Prelim. |- |9,15||9,15||9,15||9,00||36,45||18,125 |- !colspan=4|Total (results + prelim.) |colspan=2|54,575 |}
Maria João Falcão — 35,90 pts (→ 22nd) { |class=wikitable style="text-align:center;" !Hoop!!Ball!!Clubs!!Ribbon!!Results |- |9,05||9,00||9,20||8,65||35,90 |- !colspan=4|Total |35,90 |}
Judo
Men's Extra Lightweight (–60 kg): João Neves Pool B Round 1 — Shinji Hosokawa (JPN) (→ lost by ippon) Repêchage — Luís Shinoara (BRA) (→ lost by default, did not advance)
Men's Half Lightweight (–65 kg): Rui Rosa Pool A Round 1 — Bye Round 2 — Stephen Gawthorpe (GBR) (→ lost by ippon, did not advance)
Men's Lightweight (–71 kg): Hugo d'Assunção Pool B Round 1 — Federico Vixcarra (MEX) (→ lost by waza-ari, did not advance)
Men's Half Middleweight (–76 kg): António Roquete Andrade Pool A Round 1 — Javier Condor (CRC) (→ won by ippon) Round 2 — Abdoulaye Diallo (GUI) (→ won by ippon) Round 3 — Suheyl Yesilnur (TUR) (→ lost by koka, did not advance)
Modern pentathlon
Men's Individual Competition: Luís Monteiro — 4332 pts (→ 43rd) { |class=wikitable style="text-align:center;" !Event !Riding !Fencing !Swimming !Shooting !Cross-country !Total |- !Pts |1070 |472 |1016 |868 |906 |4332 |}
Manuel Barroso — 4085 pts (→ 49th) { |class=wikitable style="text-align:center;" !Event !Riding !Fencing !Swimming !Shooting !Cross-country !Total |- !Pts |818 |670 |1200 |348 |1057 |4085 |}