| Official Name: | 18 de Mayo |
| Other Name: | Dieciocho de Mayo |
| Settlement Type: | City and municipality |
| Pushpin Map: | Uruguay |
| Subdivision Type: | Country |
| Subdivision Type1: | Department |
| Established Date: | 15 March 2013 |
| Established Title: | Founded |
| Population Total: | 21,362 |
| Population As Of: | 2011 |
| Leader Title: | Mayor |
| Leader Name: | Nelson Alpuy |
| Timezone: | UTC -3 |
| Coordinates: | -34.6678°N -56.2172°W |
18 de Mayo or Dieciocho de Mayo is a city and municipality in the Canelones Department of Uruguay.
After a process of evaluation at departmental level,[1] this municipality was created in 15 March 2013.[2]
It includes several towns, belonging until that date to the municipalities of Las Piedras and Progreso, in the old Route 5 area:[2] Villa Alegria, Vista Linda, El Dorado, San Francisco, Villa Cristina, San Isidro, El Dorado Chico and Villa Foresti.
Its name commemorates the Battle of Las Piedras, which took place in 1811.
There is concern at the political and local level for giving this populous area a city status.[3]
The authority of the municipality is the Municipal Council, composed of the mayor and four councilors.
Mayors by period: