Portugal at the 2018 Summer Youth Olympics
Portugal participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.
Athletics
Beach handball
Canoeing
Portugal qualified one boat based on its performance at the 2018 World Qualification Event.- Boys' C1 - 1 boat
Fencing
Futsal
;Summary;Group D
;Semi-finals
;Finals
Gymnastics
Acrobatic
Portugal qualified a mixed pair based on its performance at the 2018 Acrobatic Gymnastics World Championship.- Mixed pair - 1 team of 2 athletes
Artistic
- Girls' artistic individual all-around - 1 quota
Trampoline
- Boys' trampoline - 1 quota
Karate
- 1 quota – Girls' −53kg
Modern pentathlon
Roller speed skating
Sailing
Portugal qualified one boat based on its performance at the Techno 293+ European Qualifier.- Boys' Techno 293+ - 1 boat
Swimming
Triathlon
Portugal qualified two athletes based on its performance at the 2018 European Youth Olympic Games Qualifier.;Individual
| Athlete | Event | Swim | Trans 1 | Bike | Trans 2 | Run | Total Time | Rank |
| Alexandre Montez | Boys | 9:44 | 0:31 | 27:23 | 0:28 | 15:33 | 53:39 | |
| Ines Rico | Girls | 10:36 | 0:42 | 31:19 | 0:32 | 20:08 | 1:03:17 | 22 |
;Relay
| Athlete | Event | Total Times per Athlete '' | Total Group Time | Rank |
| Europe 1 | Mixed Relay | 21:42 20:55 22:40 20:55 | 1:26:12 | |
| Europe 6 | Mixed Relay | 23:01 21:27 23:14 21:53 | 1:29:21 | 5 |