Helcogramma williamsi is a species of triplefin blenny in the genus Helcogramma which is widespread in the western Pacific Ocean. It is found in rocky areas with sandy channels at depths of 1mto3mm (03feetto10feetm) It was described in 2012 from a type collected from Taiwan. The specific name honours the ichthyologist Jeffrey T. Williams of the Smithsonian Institution.[1]