First law (disambiguation)

First Law is a science fiction story by Isaac Asimov.

In physics, there are two laws commonly known as the first law:

• Newton's first law of motion
• First law of thermodynamics

In biology:

• Mendel's first law of segregation

See also

• Second law (disambiguation)
• Third law (disambiguation)
• The First Law, a fantasy series by Joe Abercrombie