Araguaia Palace, Government palace at Sunflower Square, Palmas, Brazil.

Araguaia Palace is the seat of the Tocantins state government, inaugurated on 9 March 1991 in Palmas. The four-storey building with a basement stands on Praça dos Girassóis, the square from which the capital's streets and avenues were laid out. Its arches refer to the Church of Our Lady of the Rosary of the Blacks in Natividade.

The palace opened in 1991 and replaced the Palacinho, a wooden temporary structure that served as the first administrative center. This transition marked a turning point as the city established its permanent institution for regional governance.

The building incorporates architectural elements from the Church of Our Lady of the Rosary of the Blacks in Natividade through its distinctive arches. These design features reflect local building traditions and show how historical references appear in the city's modern architecture.

The palace stands on the Praça dos Girassóis, the square at the centre of Palmas's master plan from which the city's streets and avenues were laid out. The seat of the state executive power, it is a working government building, so visits focus on the exterior: four storeys above a basement, with arcades recalling the Church of Our Lady of the Rosary of the Blacks in Natividade.

The palace's arches refer to the Church of Our Lady of the Rosary of the Blacks in Natividade, a detail linking the new capital to older Tocantins architecture. The building was designed by architects Maria Luci da Costa and Ernani Vilela and inaugurated on 9 March 1991. Streets and avenues of Palmas were laid out from this landmark.