a method of fabricating a wire grid polarizer includes sequentially depositing a conductive wire pattern layer , and a plurality of guide patterns which forms one or more trenches therebetween on the conductive wire pattern layer , hydrophobically treating surfaces of the conductive wire pattern layer exposed in the trenches , and the guide patterns , coating the hydrophobically treated conductive wire pattern layer in the trenches with a neutral layer to partially fill the trenches , filling a remainder of the trenches with a block copolymer of two monomers with different etching rates , aligning the block copolymer filled in the trenches , selectively removing blocks of one monomer among the two monomers from the aligned block copolymer , and patterning the conductive wire pattern layer by using blocks of the other monomer among the two monomers remaining in the trenches and the guide patterns as a mask .