Bromine monofluoride is a quite unstable interhalogen compound with the chemical formula BrF.

Due to its lability, the compound can be detected but not isolated:[2] It is usually generated in the presence of caesium fluoride.

The molecular structure in the gas phase was determined by microwave spectroscopy; the bond length is re = 1.758981(50) Å.

[4] The bond length in a cocrystal with methylchloride is 1.822(2) Å; the lengthening relative to the free molecule is due to an interaction of the type F-Br···ClMe with a distance of 2.640(1) Å.

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