Photoresist monomers which can be used to form photoresist polymers and photoresist compositions using the same which are suitable for photolithography processes employing a deep ultraviolet light source and copolymers thereof. Monomers are represented by following Formula 1: wherein, R1, is —OH or —R—OH; R represents substituted or unsubstituted linear or branched (C1-C10) alkylene, substituted or unsubstituted (C1-C10) alkylene comprising an ether linkage, substituted or unsubstituted (C1-C10) alkylene comprising an ester linkage, or substituted or unsubstituted (C1-C10) alkylene comprising an ketone moiety; and 1 is an integer of 1 or 2.