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In this study, fluorescent nitrogen-doped carbon nanoparticles (N-CNPs) were prepared using a facile and green hydrothermal method. A number of characterization techniques were employed to analyze the physicochemical properties of prepared N-CNPs. Fluorescence spectroscopy revealed that N-CNPs exhibit bright fluorescence emission (maximum at 502 nm) under the continuous 400 nm excitation. Prepared N-CNPs were successfully utilized for optical temperature sensing in the range of 25–95 °C. The mechanism of temperature sensing was discussed. Keywords: Carbon, Nanoparticles, N-doped, Fluorescence, Temperature sensing