A national referendum-plebiscite was held on October 16–17, 1976 in the Philippines in which the majority of the barangay voters approved the continuation of martial law and ratified the proposed amendments to the Constitution substituting the Regular Batasang Pambansa with the Interim Batasang Pambansa, pursuant to Presidential Decrees Nos.

For purposes of Philippine law, a ballot question on amending, revising or approving a constitution is a plebiscite; other ballot questions asked through a nationwide electorate are referendums: There was a referendum if voters are in favor of extending martial law.

This was a constitutional plebiscite for approving amendments to the constitution: In 1977, another referendum asked the people if President Marcos should continue as president after the organization of the Interim Batasang Pambansa.

In 1978, a parliamentary election was held, the first in almost 7 years.

The election led to the organization of the Interim Batasang Pambansa.