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 Basic Laws of a country which does not use the term "constitution", or has an uncodified constitution.

Fundamental laws of nature, physics, thermodynamics, and so on.

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