Fundamental law(s) may refer to:
Organic law, in particular,
Constitution, in particular,
The Russian Constitution of 1906
The German Grundgesetz (more commonly translated as "Basic Law")
The four individual laws that together make up the Constitution of Sweden
The Fundamental Laws of England
The Fundamental Law of Vatican City State
The Fundamental Law of Hungary
The Basic Laws of a country that does not use the term "constitution" or has an uncodified constitution
Any of the fundamental physical laws of the universe
In Abrahmic religions, The Ten Commandments