The mechanisms and principles of action of the light nano-actuators are considered. It is shown that the light nanoactuators are nanoparticles, spheres, cylinders, rods, discs, gears, dumbbells, beams, spirals, springs, automobiles and plasmons. The materials of the light nanoactuators are presented: polystyrene, glass, gold, quartz, nitrogenous silicon, carbon, polymers, photocatalytic materials, photoisomers, ferrocene molecules, alkenes, zinc porphyrin, azobenzene and DNA. The sources of exposure light to nanoaccurators are described like: sunlight, polarized light, ultraviolet, photons and laser radiation. The effects and phenomena used to move nano-actuators are described: heating (including non-uniform), optical pulses, optothermal effects, Marangoni effect, thermophoresis, photocatalysis, polarization, resonance, light emission, photoisomerization, chirality, Van der Waals forces and plasmons.