A fan-out semiconductor package includes: a semiconductor chip having an active surface with connection pads disposed thereon and an inactive surface opposing the active surface; an encapsulant encapsulating at least portions of the semiconductor chip; and a first connection member disposed on the active surface of the semiconductor chip, wherein the encapsulant is a cured photosensitive resin composition including a thermosetting resin, a carboxylic resin, an ethylenically unsaturated compound, and a reinforcing agent. The photosensitive resin composition may be used in the fan-out semiconductor package.