Unitarianists or Unitarians (in Spanish, Unitarios) were the proponents of the concept of a unitary state (centralized government) in Buenos Aires during the civil wars that shortly followed the Declaration of Independence of Argentina in 1816.

Forced to resign, the Government of Buenos Aires and the Foreign relations of the country were taken over by Federalist Manuel Dorrego.

However, a contingent of military led by Juan Lavalle, opposed to the peace negotiations with the Brazilian Empire after the end of the Cisplatine War took over the Buenos Aires Government and shot Dorrego at Navarro.

In 1859 Buenos Aires was forced to accept the federal constitution of 1853 after six years of secession, after Mitre was defeated at the 1859 Battle of Cepeda by Urquiza.

[1] This group was led by intellectuals, merchants and the military from Buenos Aires and by some members of the elites of the provinces of the interior of the country.

[1] In the political field, the Unitarians defended the establishment of a central government with broad powers, which could impose its authority over the provinces.