Masanaga Kageyama (影山 雅永, Kageyama Masanaga, born May 23, 1967) is a Japanese former footballer and manager.

Kageyama was born in Iwaki on May 23, 1967. After graduating from University of Tsukuba, he joined Furukawa Electric (later JEF United Ichihara) in 1990. He became a regular player as center back from 1991. He moved to Urawa Reds in 1995. However he could not play in the match and moved to Japan Football League club Brummell Sendai in 1996. He retired end of 1996 season.

After retirement, Kageyama served as technical staff for Japan national team. In 2001, he signed with Sanfrecce Hiroshima and became a coach. In 2006, he moved to Macau and became a manager for Macau national team. In 2008, he moved to Singapore and became a manager for Singapore U-16 national team. Although he managed at 2008 AFC U-16 Championship, U-16 Singapore lost all 3 matches. In 2009, he returned to Japan and signed with newly was promoted to J2 League club, Fagiano Okayama. He became a coach in 2009, and a manager as Satoshi Tezuka's successor in 2010. He managed the club until 2014. In 2017, Kageyama became a manager for Japan U-20 national team. U-20 Japan won the 3rd place at 2018 AFC U-19 Championship and qualified for 2019 U-20 World Cup.

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