Kirchhoff's laws, named after Gustav Kirchhoff, may refer to:
Kirchhoff's circuit laws in electrical engineering Kirchhoff's law of thermal radiation Kirchhoff equations in fluid dynamics Kirchhoff's three laws of spectroscopy Kirchhoff's law of thermochemistry Kirchhoff's theorem about the number of spanning trees in a graph
See also Kerckhoffs's principle, of Auguste Kerckhoffs List of scientific laws named after people Ohm's law