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The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of in the International System of Units (SI), equal to one () of a () and to 1000 . One nanometre can be expressed in scientific notation as , and as  metres.

The nanometre was formerly known as the "millimicrometre" – or, more commonly, the "millimicron" for short – since it is of a , and was often denoted by the symbol mμ or, more rarely, as μμ (which is confusing, since μμ should logically refer to a millionth of a micron).

The name combines the (from the νάνος, nanos, "dwarf") with the parent unit name metre (from Greek μέτρον, metrοn, "unit of measurement").

are based on physical processes which occur on a scale of nanometres (see ).

The nanometre is often used to express dimensions on an atomic scale: the diameter of a atom, for example, is about 0.06 nm, and that of a is about 20 nm. The nanometre is also commonly used to specify the of electromagnetic radiation near the visible part of the spectrum: visible light ranges from around 400 to 700 nm.Hewakuruppu, Y., et al., Plasmonic " pump – probe " method to study semi-transparent nanofluids, Applied Optics, 52(24):6041-6050 The ångström, which is equal to 0.1 nm, was formerly used for these purposes.

Since the late 1980s, in usages such as the 32 nm and the 22 nm semiconductor node, it has also been used to describe typical feature sizes in successive generations of the ITRS Roadmap for miniaturized semiconductor device fabrication in the semiconductor industry.

The CJK Compatibility block in has the symbol .

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