A new species of the genusClionaGrant is described from the Ionian Sea (Eastern Mediterranean).Cliona parenzanisp. n. is characterized by an encrusting or massive shape and a spiculation consisting of robust tylostyles, together with spiny and smooth‐spirasters. The new species is very close to the group of related speciesC. nigricans(Schmidt),C. viridis(Schmidt), andC. copiosaSara from which it mainly differs by the occurrence of reduced spirasters that lost their spines.