Others
- Kirchhoff (crater), the lunar crater named for Gustav Kirchhoff
- Kirchhoff Institute of Physics, a research institute in Heidelberg, Germany
- Kirchhoff's laws, a group of laws of physics (in thermodynamics, electrical circuits, spectroscopy, and fluid mechanics) named for Gustav Kirchhoff
- Kirchhoff's theorem, in graph theory, a theorem concerning the number of "spanning trees" in a graph, named for Gustav Kirchhoff
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