Keiko Sonoda is a Japanese voice actor and actress affiliated with the talent agency Mausu Promotion. She was born on November 15, 1970, in Yamagata Prefecture.

Sonoda has built a career through numerous supporting roles in anime series, original video animations, and dubbed versions of foreign films. In anime, her roles include Daigo's Mother in the 1999 special Megumi no Daigo, Emi Ishibashi in the 2001 series Pachislo Kizoku Gin, and the role of Mio in Stepmother's Sin. She also contributed voices to productions such as Tide-Line Blue, providing the voice for Emma in 2005, and the anime film Nitaboh, where she was listed as a cast member.

Her work also extends to voice acting in popular long-running series. She voiced the minor character Ibara in the first episode of the Naruto anime in 2002. In the television series Ayashi no Ceres, which aired in 2000, she provided voices for a nurse and other minor characters across multiple episodes.

Beyond anime, a significant portion of Sonoda's career involves Japanese dubbing of overseas films. Her credits in this field include providing the Japanese voice for characters in major Hollywood films such as The Rock in 1996, Battlefield Earth in 2000, 21 Grams in 2004, and The Ring Two in 2005.