Kageyama Toshiro (影山利郎 Kageyama Toshirō, "Kage", 21st June 1926 - 31st July 1990) was a Japanese 7-dan professional Go player.
A go player since his youth, he won the All-Japan Amateur Honinbo tournament in 1948 and turned professional the following year. His promotion record is:
- Shodan 1949
- 2-dan 1950
- 3-dan 1951
- 4-dan 1953
- 5-dan 1955
- 6-dan 1961
- 7-dan 1977
In 1953 he took first place in the second division of the Oteai (the professional rating tournament) and in 1965 and 1966 he was runner-up in the Kodansha tournament (a competition among 5- to 7-dan professionals). In 1967 he won the Takamatsu-no-miya Prize.
He was known for his steady style of play and accuracy at calculation. He was active in the amateur go world until his death.