Osamu Saka

Television animation

• Gigantor (1963) – Gavan
• Kamui the Ninja (1969) – Sukumi
• Space Battleship Yamato (1974) – Goer
• La Seine no Hoshi (1975) – Louis XVI
• The Super Dimension Fortress Macross (1982) – Admiral Takashi Hayase
• Dragon Ball (1987) – Grandpa Son Gohan
• Little Women (1987) – Frederick March (Father)
• Patlabor (1989) – Seitaro Sakaki
• Anime Himitsu no Hanazono (1991) - Clevin/Craven
• Sailor Moon (1992) – Sakiko's Father (ep. 20), Old Man Owner (ep. 71), Edwards (ep. 108)
• In the Beginning: The Bible Stories (1997) – Aaron
• Ehrgeiz (1997) – Balzak
• Cardcaptor Sakura (1998) – Masaki Amamiya (Sakura's great-grandfather)
• Chance Pop Session (2001) – Sho Kaibara
• Ghost in the Shell: Stand Alone Complex (2001) – Daisuke Aramaki
• Black Jack (2006) – Dr. Jotaro Honma
• Skull Man (2007) – Gōzō Kuroshio
• Blade (2011) – Noah Van Hellsing
• Sword Art Online (2013) – Leviathan
• Knights of Sidonia (2014) – Shinsuke Tanba
• Marvel Disk Wars: The Avengers (2014) – Charles Xavier / Professor X
• Pandora in the Crimson Shell: Ghost Urn (2016) – Poseidon (ep. 12)

Original video animation (OVA)

• Legend of the Galactic Heroes (1988) – Kaiser Friedrich IV
• Ariel (1989) – Dr. Kishida
• Record of Lodoss War (1990) – King Fahn
• Mobile Suit Gundam 0083: Stardust Memory (1991) – Marneri
• The Silent Service (1995) – Toshio Takegami
• Ninja Resurrection (1998) – Miyamoto Musashi
• Hellsing Ultimate 1 (2006) – Father Rinaldo
• My-Otome 0~S.ifr~ (2008) – John Smith

Theatrical animation

• The Castle of Cagliostro (1979) – British Delegate
• Patlabor: The Movie (1989) – Seitaro Sakaki
• Doraemon: Nobita's Dorabian Nights (1991) (Shinto Paddo)
• Porco Rosso (1992) – Sky Bandit
• Ninja Scroll (1993) – Masked Samurai
• Patlabor 2: The Movie (1993) – Seitaro Sakaki
• Memories (1995) – Kamata
• Slayers The Motion Picture (1995) – Rowdy Gabriev
• Doraemon: Nobita's Great Adventure in the South Seas (1998) (Captain Colt)
• Doraemon: Nobita in the Wan-Nyan Spacetime Odyssey (2004) (Ichi/Hachi (old))
• Steamboy (2004) – The Admiral

Tokusatsu

• The Return of Ultraman (1971) Alien Baltan Jr. (ep. 41), Alien Stora (ep. 42), Alien Bat (ep. 51)
• Kamen Rider (1971) Bearconger (ep. 46)
• Mirrorman (1971) Invader of Ep. 48
• Kamen Rider vs. Shocker (1972) Rebirth Mograng, Rebirth Monsters
• Ultraman Ace (1972) Zoffy of Ep. 5/35, Undergroundmon (ep. 29), Ultraseven of Ep. 31
• Henshin Ninja Arashi (1972) Franken (ep. 21, 24)
• Fireman (1973) Planet Metlor Telecommunications equipment
• Henshin! Ponpoko Dama (1973) PekePeke
• Kure Kure Takora (1973) Narration, Debura, Biragon, The Sea Cucumber Gang
• Kamen Rider X (1974) The G.O.D. Secret Organization (eps. 1 - 21)
• Kamen Rider Amazon (1974) Ruler of Garanda Empire (Real Great Emperor Zero) (eps. 23 - 24)
• Choujin Bibyun (1976) Matsubo (ep. 9)
• Space Ironmen Kyodyne (1976) Robon Foot 1 (ep. 18 - 19)
• The War in Space (1977) Dr. Schmitt (Actor : William Ross)

Video games

• Lloyd in Anubis: Zone of Enders
• Bankotsu in the Dead or Alive series
• Zera in Grandia II
• Kanbei Kuroda in Kessen
• Gatse Becker in Policenauts
• Colonel Sergei Gurlukovich in Metal Gear Solid 2: Sons of Liberty
• The End in Metal Gear Solid 3: Snake Eater
• Code Talker in Metal Gear Solid V: The Phantom Pain
• Dr. Dimitri Yuriev in Xenosaga Episode II: Jenseits von Gut und Böse

Dubbing roles