The metallic nanoparticles are widely applied recent years as photothermal agents in laser and optical nanotechnology for light-to-heat conversion, treatment of materials containing NPs, laser nanomedicine, radiation chemistry and catalysis due to their plasmonic and thermo-optical properties. The influence of nanoparticle (NP) parameters - type of NP metal (aurum, silver, latinum, cobalt, zinc, nickel, titanium, cuprum, aluminum, molybdenum, vanadium, palladium), NP radius, optical indexes of NP metal, characteristics of radiation (wavelength, pulse duration) on plasmonic and thermo-optical properties has been investigated. The dependencies of efficiency factors of absorption Kabs, scattering Ksca and extinction Kext and thermo-optical parameter for pulse durations of 1 ps, 10 ns have been investigated n wavelength in the spectral interval 200–1000 nm. The indicatrixes of scattered radiation in the spectral interval 350–570 nm by NPs with the radii in the range 10–100 nm were analyzed. It is established that maximal value of thermo-optical parameter (maximal NP temperature) can be achieved with the use of the value of Kabs smaller than its maximal value on the dependence of radiation pulse duration and NP radius. This paper presents a platform for the characterization and the selection of the plasmonic and thermooptical properties of metallic NPs for their photonic and photothermal applications.