Yumiko Kobayashi is a Japanese voice actress. She is a freelance voice actor, but until August 2007 was affiliated with Arts Vision. Kobayashi was born in Chiba Prefecture. She and fellow Excel Saga voice actress Mikako Takahashi are known as the duo "The Excel Girls". She is also part of the voice actress quartet "Prits" along with Natsuko Kuwatani, Nana Mizuki, and Hisayo Mochizuki; all four voiced characters in Sister Princess.