A monoazo compound represented by the following formula (I) in the free acid form:

wherein X is an alkylamino, C₅-C₇ cycloalkylamino, piperidino, pyrrolidino or morpholino group which is unsubstituted or substituted with a substituent other than sulfo, R is hydrogen or unsubstituted or substituted C₁-C₄ alkyl, R₁ and R₂ independently of one another are each hydrogen, methoxy, ethoxy, methyl, ethyl, chloro, bromo, nitro, carboxy or sulfo, Z is vinyl or -CH₂CH₂Y in which Y is a group which is split by the action of an alkali and p is 0 or 1. This compound is a reactive dye suitable for dyeing or printing fiber materials containing hydroxyl group and/or amide group in red color. This compound is high in dissolvability and can give dyed or printed products excellent in dyeability such as build-up property and various fastnesses.