Masakatsu Takagi (高木正勝, Takagi Masakatsu, born 1979) is a musician and filmmaker from Kameoka, Kyoto, Japan. He attended Kyoto University of Foreign Studies, graduating with English.

He wrote the score for Mamoru Hosoda's films Wolf Children (2012), The Boy and the Beast (2015) and Mirai (2018). He also wrote the music for the Studio Ghibli documentary The Kingdom of Dreams and Madness (2013).

His work has been noticed by Apple Inc., and a 3-minute promotional video for the company was made about how Takagi creates his videos on a Macintosh system, and Apple Pro software, including Final Cut Pro and Logic Pro. He also uses Adobe After Effects and Adobe Photoshop in his videos.

From a period in 2003 to 2004 he toured with David Sylvian on the "Fire in the Forest" Tour, creating visuals to accompany the performances. The two later collaborated on the track "Exit/Delete" from Coieda (2004).

In 2013 Takagi moved to a village in Hyogo, Japan, where he lives with his wife and children.

In 2018 he began the Marginalia series, a series of improvised piano performances from his private studio in Hyogo recorded with the windows open to capture the sound of the local nature and wildlife. These recordings are released on Bandcamp and Spotify, and the works have resulted in five studio albums.