"First Law" is a science fiction story by Isaac Asimov.

First law may also refer to:

• Newton's first law of motion
• First law of thermodynamics
• First law of crystallography
• Mendel's first law of segregation
• Tikanga Māori, the law of the Maori

See also

• Second law (disambiguation)
• Third law (disambiguation)
• The First Law , a fantasy series by Joe Abercrombie
• The First Law (film), a 1918 silent film
• Three Laws of Robotics

This disambiguation page lists articles associated with the title First law.
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