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Takeshi Seyama (瀬山 武司, Seyama Takeshi, born in 1944) is a Japanese film editor from Tokyo.

Seyama is the editor of many anime series and movies from Studio Ghibli, Katsuhiro Otomo, and Satoshi Kon, including hits such as Princess Mononoke, Steamboy, and Paprika. In 1992, Seyama founded the "Seyama Editing Room," which specializes in editing anime.

-As Editor

• Heidi, Girl of the Alps (1974) - 1 episode
• Princess Sarah (1985) - TV Series
• Sherlock Hound (1984-85) - 6 Episodes
• Castle in the Sky (1986)
• My Neighbor Totoro (1988)
• Grave of the Fireflies (1988)
• Akira (1988)
• Venus Wars (1989)
• Kiki's Delivery Service (1989)
• Only Yesterday (1991)
• Ocean Waves (1993)
• Memories (1995)
• Whisper of the Heart (1995)
• Princess Mononoke (1997)
• My Neighbors the Yamadas (1999)
• Princess Arete (2001)
• Spirited Away (2001)
• WXIII: Patlabor the Movie 3 (2002)
• Tokyo Godfathers (2003)
• Steamboy (2004)
• Howl's Moving Castle (2004)
• Paprika (2006)
• Tales from Earthsea (2006)
• Ponyo (2008)
• From Up on Poppy Hill (2011)
• The Wind Rises (2013)
• When Marnie Was There (2014)
• Okko's Inn (2018)
• The Boy and the Heron (2023)

• Takeshi Seyama at IMDb
• Takeshi Seyama at Anime News Network's encyclopedia

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