| Games: | Summer Youth Olympics |
| Games Link: | 2018 Summer Youth Olympics |
| Year: | 2018 |
| Noc: | SMR |
| Nocname: | Comitato Olimpico Nazionale Sammarinese |
| Competitors: | 4 |
| Sports: | 3 |
| Location: | Buenos Aires, Argentina |
| Start Date: | 6 |
| End Date: | 18 October 2018 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Appearances: | auto |
San Marino participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.[1]
See main article: Archery at the 2018 Summer Youth Olympics. San Marino qualified one athlete.
See main article: Swimming at the 2018 Summer Youth Olympics. San Marino qualified two athletes.
| Athlete | Event | Heats | Semifinals | Final | |||
|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | ||
| Raffaele Tamagnini | Boys' 50 metre freestyle | 24.87 | 38 | did not advance | |||
| Boys' 100 metre freestyle | 55.55 | 39 | did not advance | ||||
| Arianna Valloni | Girls' 400 metre freestyle | 4:26.87 | 22 | did not advance | |||
| Girls' 800 metre freestyle | 8:57.00 | 15 | did not advance | ||||
See main article: Table tennis at the 2018 Summer Youth Olympics. San Marino qualified one athlete.
| Athlete | Event | Group stage | Round of 16 | Quarterfinals | Semifinals | Final / | |||
|---|---|---|---|---|---|---|---|---|---|
| Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank | |||
| Chiara Morri | Girls' singles | L 0–4 L 0–4 L 0–4 | 4 | did not advance | |||||
| Intercontinental–5 | Mixed team | L 0–3 L 0–3 L 0–3 | 4 | did not advance | |||||