Abstract: As a high-carbon, high-alloy steel, M2 high-speed steel (HSS) is widely used in cutting tool applications. This study employed electron beam powder bed fusion (EB-PBF) additive manufacturing to fabricate M2 HSS, systematically investigating the effects of input energy density (VED) on density, microstructure, and corrosion behavior. A comparative analysis was conducted on the corrosion resistance differences between EB-PBF fabricated and wrought M2 HSS in 3.5 wt.% NaCl solution. Key findings include: the EB-PBF fabricated M2 HSS exhibited refined grain sizes (5-8 μm) with homogeneously dispersed carbides (<2 μm) in near-spherical or short rod-like morphologies. Notably, coarse primary carbides commonly observed in cast-forged M2 steel were absent. At an optimal VED of 43.3 J·mm?3, the EB-PBF fabricated M2 HSS achieved peak density (99.8%). Its corrosion current density and charge transfer resistance were respectively 33.4% and 123.7% of those measured in wrought M2 HSS, demonstrating significantly enhanced corrosion resistance.