Saki Kōsaka is a Japanese voice actress from Chiba Prefecture who is affiliated with the talent agency Air Agency. Her birthday is May 25. She is known for providing the voice of the character Gold City in the Uma Musume: Pretty Derby franchise, appearing in the BNW no Chikai installment as well as the ongoing series Uma Musume: Cinderella Gray. Her other anime voice roles include Okiku in The House Spirit Tatami-chan and Tamami Miyazawa in Chuhai Lips: Canned Flavor of Married Women. She also voiced the character Molly in the anime Izure Saikō no Renkinjutsushi? (Winter 2025). Beyond television anime appearances, Kōsaka has performed background character roles in series such as Bokutachi wa Benkyō ga Dekinai, High Score Girl, and Toaru Kagaku no Railgun T, and she participated in a drama CD for The Case Files of Lord El-Melloi II. In the video game field, she voices the character Shima Sakon in Monster Strike.