Kiyoshi Hiyama (比山貴咏史; Hiyama Kiyoshi) is a Japanese male singer and the voice provider for the Vocaloid2 Kiyoteru Hiyama.
The name of this voice provider was undisclosed at the initial distribution of Kiyoteru. Yamaha gave a vague hint that the vocal was from "A talented professional singer who has been joining the development of Vocaloid", still Kiyoshi's name was going around among some fans.
On August 12, 2010 Kiyoshi disclosed in a Nicocast that he was behind the Vocaloid Kiyoteru.
He also made one of VY1v3's demo songs.