4-Nitrobiphenyl is an organic compound with the formula C6H5−C6H4NO2.

It is one of three isomers of nitrobiphenyl and probably the most widely used.

4-Nitrobiphenyl is readily prepared by nitration of biphenyl.

[1] It can also be prepared by cross-coupling reactions.

[2] 4-Nitrobiphenyl is commonly invoked as a pollutant.