The Fleischer Studios credits Popeye voice actor Jack Mercer, while the character's article on Don Markstein's Toonopedia indicated that standard reference sources didn't name Grampy's voice actor, aside from some isolated mentions crediting Everett Clark for the role.
The Fleischer Studios and Toonopedia both acknowledge Jack Mercer as the voice of Popeye, while standard reference sources lack information on Grampy's voice actor, except for some limited mentions crediting Everett Clark.