The microstructure and corrosion behavior of 316L stainless steel (316L SS) fabricated by laser powder bed fusion (LPBF) and subsequently annealed at 800 o C, 1000 o C, and 1200 o C for 4 h were investigated. Surface characterization and electrochemical measurements were employed. The results showed that the annealing treatment did not alter the phase composition of LPBF 316L SS. However, the grain size increased progressively with annealing temperature increasing. The low angle grain boundaries