Plaza Dos de Mayo, Public square in Historic Centre, Lima, Peru.

Plaza Dos de Mayo is a circular square at the junction of Alfonso Ugarte, Colmena and Colonial avenues in Lima. At its centre stands a grey fluted column on a tiered stone base ringed by a low black metal fence, with seated bronze figures at the corners and a winged female figure holding a wreath on top. Red-tiled walkways and lawn sections with rectangular grates surround the platform.

The square opened in 1799 as the Óvalo de la Reina, laid out by Viceroy Ambrosio O'Higgins beside the old Callao gate. After the 2 May 1866 battle of Callao, President Mariano Ignacio Prado renamed it and launched a monument competition, won in 1868 by Edmond Guillaume and Louis-Léon Cugnot, who cast it in Paris. Construction began on 13 May 1873 and the square was inaugurated on 28 July 1874.

The monument's four corner bronzes, seated on the plinth, personify Peru, Bolivia, Chile and Ecuador, the members of the Quadruple Alliance against Spain. The competition rules of 1868 required four statues for these countries, and the finial was changed from a bust of José Gálvez to the winged Victory holding a wreath. The square's name comes from the date of the 1866 battle.

The square sits at the junction of Alfonso Ugarte, La Colmena and Colonial avenues, on the southwestern edge of the historic centre's buffer zone. A vehicular tunnel runs beneath it, so through traffic passes underground. Pedestrian crossings linking the square with Paseo Colón and Jirón Paraguay were announced with the 2024 works.

The monument was made in Paris by architect Edmond Guillaume and sculptor Louis-Léon Cugnot, then shipped and reassembled in Lima between 1873 and 1874. It cost 220,000 francs, with about 10,000 more for transport and placement. The winged figure on top is a Victory holding a wreath, substituted for a planned bust of José Gálvez.