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A biocompatible fluorescent nanoprobe for the detection of reactive oxygen species in biological systems has been designed, synthesized and characterized, circumventing some of the limitations of the molecular probe diacetyl 2′,7′‐dichlorodihydrofluorescein (DCFH‐DA). It has been synthetized the nanoparticulate form of DCFH‐DA by covalently attaching the widely used fluorescent probe DCFH‐DA to a mesoporous silica nanoparticle through a linker. The reactivity of nanoDCFH‐DA has been tested toward several reactive oxygen species. In addition, it has been proved to slow down DCFH‐DA reaction with molecular oxygen and it hampers from interactions with proteins. As a final piece of evidence, in vitro studies showed that the nanoprobe is internalized by HeLa cancer cells, thus being capable of detecting intracellularly generated reactive oxygen species. To sum up, it can be stated that nanoDCFH …