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The Institutional Acts were extra-legal decrees issued by the Brazilian military dictatorship between 1964 and 1969. The acts were not subject to judicial review and superseded the 1946 constitution, serving as a vehicle for major legislative reforms that precluded the removal of the constitution.

There were 17 Institutional Acts and over 100 Complementary Acts, which elaborated on the former's general intent. The need for a comprehensive legal framework for the regime eventually led to the enactment of the 1967 constitution.

The acts were rescinded in the late 1970s during the redemocratization of Brazil.^[1]

• Brazilian Military Criminal Code