May Avenue (Spanish: Avenida de Mayo) is an avenue in Buenos Aires, capital of Argentina. It connects the Plaza de Mayo with Congressional Plaza, and extends 1.5 km (0.93 mi) in a west–east direction before merging into Rivadavia Avenue.

Built on an initiative by Mayor Torcuato de Alvear, work began in 1885 and was completed in 1894. The avenue is often compared with La Gran Vía in Madrid, although the Spanish avenue was built later (1910). It is also compared to those in Paris or Barcelona due to its sophisticated buildings of art nouveau, neoclassic and eclectic styles. The avenue was named in honor of the May Revolution of 1810 (the event that led to Argentine Independence). The site of the assembly that touched off the revolution (the Buenos Aires Cabildo) was partially demolished in 1888 to make way for the avenue's entry into Plaza de Mayo. The avenue's layout, built through existing urban blocks instead of via the widening of a parallel street, was designed by the municipal public works director, Juan Antonio Buschiazzo. Buschiazzo was also commissioned to design a number of the buildings along the avenue (among them, City Hall) after Mayor Miguel Cané enacted strict architectural zoning laws for the area facing the new thoroughfare. The recession caused by the Panic of 1890 led to delays and a rollback of many of the more ornate plans for the avenue, which was inaugurated on July 9, 1894 (the 78th anniversary of Independence).