The National Renewal Alliance (Portuguese: Aliança Renovadora Nacional, ARENA) was a far-right political party that existed in Brazil between 1966 and 1979.

ARENA was part of a two-party system enforced by the dictatorship instituted in 1966, where only it and the Brazilian Democratic Movement (MDB) — the "consented opposition" — were allowed.

For example, in the late 1968 President Artur da Costa e Silva demanded that Congress prosecute the congressman Márcio Moreira Alves for suggesting that women should refuse to dance with military cadets.

Almost as soon as he signed AI-5 into law, Costa e Silva used its provisions to close Congress for almost two years, thus placing Brazil under a tight dictatorship.

The government reacted by decreeing the recess of the National Congress and editing on April 13, 1977 a set of constitutional amendments and decree-laws known as April Package (Pacote de Abril) which provided for the appointment of a third of senators, extended the presidential term to six years, restricted opposition power and even succeeded in annulling the mandates of some Congressmen of the MDB.