Pentaamminenitritocobalt(III) chloride is an inorganic compound with the molecular formula [Co(NH3)5(NO2)]Cl2.

Although it has no applications, the compound has been of academic interest as a source of the transition metal nitrite complex [Co(NH3)5(NO2)]2+.

The coordination complexes [Co(NH3)5(NO2)]2+ and [Co(NH3)5(ONO)]2+ provided an early example of linkage isomerism.

This nitritopentaamminecobalt(III) isomer converts to the more stable nitro form at room temperature.

Nitropentaamminecobalt(III) chloride has been studied for its ability to repress cell division.