The Constitution of Norway (complete name: The Constitution of the Kingdom of Norway; Danish: Kongeriget Norges Grundlov; Norwegian Bokmål: Kongeriket Norges Grunnlov; Norwegian Nynorsk: Kongeriket Noregs Grunnlov) was adopted on 16 May and signed on 17 May 1814 by the Norwegian Constituent Assembly at Eidsvoll. The latter date is the National Day of Norway; it marks the establishment of the constitution.

It was considered one of the world's most liberal and democratic constitutions. It is the fourth oldest written single-document national constitution in Europe after the Constitution of Poland, the French constitution of 1791, and the Spanish Constitution of 1812, and the second oldest working national constitution in the world, after the Constitution of the United States. In May 2014, the Storting passed the most substantial changes since 1814, particularly by including paragraphs on human rights.