The 18 May 1811 Medal (Spanish: Medalla 18 de Mayo 1811) is the second highest military decoration of the Uruguayan Army.

The medal is presented in three classes and are awarded based on the rank of the recipient.

[1] The medal is awarded to Uruguayan and foreign military officers, as well as civilians, for outstanding achievement and meritorious service.

[2] The design of the medal depicts a four-armed cross of the sun's rays in silver.

The second class medal adds a golden laurel wreath around the cockade, while the first class medal includes the laurel wreath as well as three gold five-pointed start surmounting the cockade.