A fluorescent chemical sensor for Hg(Ⅱ) using 5,10,15-tris(pentafluorophenyl)corrole (H3(tpfc)) as fluorophore is described in this paper. Theresponse of the sensor is based on the fluorescence quenching of H3(tpfc) by coordination with Hg(II). H3(tpfc) based sensor shows a linearresponse towards Hg(II) in the concentration range from 1.2×10−7 to 1.0×10−4 M, with a working pH range from 5.0 to 8.0. The response timefor Hg(Ⅱ) concentration ≤1.0×10−5M is less than 5 min. The sensor shows good selectivity for Hg(Ⅱ) over alkali, and alkaline earth, and mostof transition metal cations. The effect of the composition of the sensor membrane has been studied and the experimental conditions optimized.The corrole based sensor membrane can be easily regenerated just by washing with blank buffer solution after each measurement. The sensor hasbeen used for determination of Hg(Ⅱ) in water samples with satisfactory results.