Rikako Aikawa (愛河 里花子, Aikawa Rikako, born October 7, 1967) is a Japanese actress and voice actress affiliated with Atomic Monkey. She was born in Kanagawa Prefecture, Japan. She was originally a child actress. Her real name after she married Mitsuo Iwata, a Japanese voice actor, is Nahomi Iwata (岩田 菜穂美, Iwata Nahomi).

She appears in the Japanese and English-language versions of the Pokémon anime, voicing Ash's Caterpie, Metapod and Butterfree and his Krabby. She had a main role in the Orange League series where she voiced Ash's Lapras in both versions. She also appeared in the second Pokémon movie as the legendary Fire Pokémon, Moltres. She had a recurring role in the Johto series as Charla, Liza's female Charizard, a Pokémon who lives at the Charicific Valley and who eventually developed a romantic relationship with Ash's Charizard. She also played Madame Muchmoney's Granbull.

She is also known as a specialist of tongue-twisters in the Japanese language.