| Competition: | Uruguayan Primera División |
| Season: | 1918 (18th) |
| Winners: | Peñarol (6th title) |
| Relegated: | Misiones |
| Continentalcup1 Qualifiers: | Peñarol |
| Matches: | 90 |
| Total Goals: | 230 |
| Prevseason: | 1917 |
| Nextseason: | 1919 |
The 1918 Primera División was the 18th season of Uruguay's top-flight football league.
The tournament consisted of a two-wheel championship of all against all. It involved ten teams, and the champion was Peñarol, winning the first championship under that name and sixth if considered as a successor of Central Uruguay Railway Cricket Club.
| Team | City | Stadium | Capacity | Foundation | Seasons | Consecutive seasons | Titles | 1917 | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Central | Montevideo | 5 January 1905 | 9 | 9 | align=center | - | 7th | |||||
| Charley | Montevideo | 1 | 1 | align=center | - | 8th | ||||||
| Dublin | Montevideo | 7 | 2 | align=center | - | 6th | ||||||
| Misiones | Montevideo | 26 May 1906 | align=center | - | align=center | - | align=center | - | align=center | - | ||
| Nacional | Montevideo | Gran Parque Central | 15,000 | 14 May 1899 | 16 | 16 | 6 | 1st | ||||
| Peñarol / CURCC | Montevideo | 28 September 1891 | 17 | 17 | 5 | 2nd | ||||||
| Reformers | Montevideo | 5 | 5 | align=center | - | 9th | ||||||
| River Plate | Montevideo | 1897 | 11 | 11 | 4 | 5th | ||||||
| Universal | Montevideo | 6 | 6 | align=center | - | 3rd | ||||||
| Montevideo Wanderers | Montevideo | 15 August 1902 | 14 | 14 | 2 | 4th |