Megumi Toyoguchi (豊口 めぐみ, Toyoguchi Megumi, born January 2, 1978) is a Japanese voice actress and narrator affiliated by 81 Produce.

Some of her starring roles are Yao Sakurakouji in Miami Guns, Ran Kotobuki in Super Gals!, Winry Rockbell in Fullmetal Alchemist (first anime), Sei Sato in Maria-sama ga Miteru, Revy in Black Lagoon, Hikari (Dawn) in Pokémon and Seiren/Ellen Kurokawa/Cure Beat in Suite Precure. In video games, she played Paine in Final Fantasy X-2, Junko Enoshima in Danganronpa, Rosie in Valkyria Chronicles, Yukari Takeba in Persona 3 (which has adapted into a film series) and Aqua in Kingdom Hearts.