Scutellastra optima is a species of true limpet, a marine gastropod mollusk in the family Patellidae.
The shell of the holotype measures .
Scutellastra optima occurs in the northwestern Pacific. The holotype was obtained from Yakushima (Japan).
Nakano T. & Ozawa T. (2007). Worldwide phylogeography of limpets of the order Patellogastropoda: molecular, morphological and paleontological evidence. Journal of Molluscan Studies 73(1): 79–99.