Abstract. -Using a semiclassical approach, we have calculated electron−, proton−, and ionized helium−impact line widths and shifts for 33 Sr I multiplets for perturber densities 10 13 cm −3 (for stellar plasma research) and 10 15 − 10 18 cm −3 (for laboratory plasma research) and temperatures T = 2 500 − 50 000 K.