An ink composition is provided that includes a condensed polycyclic aromatic compound, a polymerization initiator, and a polymerizable compound, and the condensed polycyclic aromatic compound is a compound selected from the group consisting of a compound represented by the formula below, a compound having at least three hydroxy groups, alkoxy groups, and/or aryloxy groups on a condensed polycyclic aromatic ring, and a compound having at least one atom having an atomic weight of 32 or greater bonded to a condensed polycyclic aromatic ring and/or one group bonded to the condensed polycyclic aromatic ring via an atom having an atomic weight of 32 or greater. There are also provided a printed material obtained by employing the ink composition, a process for producing a lithographic printing plate employing the ink composition, and a lithographic printing plate obtained by the production process. R4m—Ar-A-SiR1R2R3)n