| Competition: | Campionato Sammarinese di Calcio |
| Season: | 2018–19 |
| Winners: | Tre Penne |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Tre Penne |
| Continentalcup2: | Europa League |
| Continentalcup2 Qualifiers: | La Fiorita |
| Matches: | 158 |
| Total Goals: | 503 |
| Prevseason: | 2017–18 |
| Nextseason: | 2019–20 |
| Updated: | 24 May 2019 |
The 2018–19 Campionato Sammarinese di Calcio was the 34th season since its establishment. It is the highest level in San Marino, in which the country's top 15 amateur football clubs played. The season began on 21 September 2018 and concluded with the play-off final on 25 May 2019. La Fiorita were the defending champions from the previous season.
Because there is no promotion or relegation in the league, the same 15 teams who competed in the league last season competed in the league this season.
The 15 clubs were split into two groups; one with eight clubs and another with seven clubs. All teams played once against the teams within their own group. At the end of the regular season, the top four from each group advanced to group 1 of the second stage. All other teams advanced to group 2 of the second stage.[1]
The fifteen clubs played each other twice within their own group. At the end of the second stage, the first through sixth-placed clubs from group 1 advanced to the final stage. From group 2, the first and second-placed clubs advanced to the final stage.[1]
The winner of the play–off, Juvenes/Dogana, advanced to the final stage.
|+Semi-finals|}|+7th place|}|+5th place|}
The eight clubs which advanced from the second stage competed in a knockout format final stage to determine the champion of the league.[1]
The first legs of the quarter-finals were played from 25 to 28 April 2019 and the second legs were played from 2 to 5 May 2019. The first legs of the semi-finals will be played on 11–12 May 2019 and the second legs will be played on 17–18 May 2019.[2] |+Quarter finals|}|+Semi finals|}|+Third place|}|+Final|}
La Fiorita won 6–0 on aggregate.----Libertas won 5–0 on aggregate.----Tre Fiori won 3–1 on aggregate.----Tre Penne won 2–1 on aggregate.
La Fiorita won 5–0 on aggregate.----Tre Penne won 3–1 on aggregate.
Tre Penne qualified for 2019–20 Champions League preliminary round and La Fiorita qualified for 2019–20 Europa League preliminary round.