This is an inclusive list of science fiction television programs whose names begin with the letter J.

Live-action

• Jack of All Trades (2000)
• Jake 2.0 (2003–2004)
• Jason of Star Command (1978–1979, Tarzan and the Super 7 segment)
• Jekyll (2007, UK)
• Jensen Project, The (2010, film)^[1][2]
• Jeopardy (2002–2004, Scotland/Australia)
• Jeremiah (2002–2004)
• Jericho (2006–2008)
• Joe 90 (1968–1969, UK, puppetry)
• John Doe (2002)
• Johnny Jupiter (1953)
• Journey of Allen Strange, The (1997–2000)
• Journey to the Center of the Earth (franchise):
  • Journey to the Center of the Earth (1989, film)
  • Journey to the Center of the Earth (1993, film) IMDb
  • Journey to the Center of the Earth (1999, miniseries) IMDb
  • Journey to the Center of the Earth (2008, film)
• Journeyman (2007)
• Jupiter Moon (1990, UK)
• Justice League of America (1997, pilot, film)

Animated

• J9 (franchise):
  • Braiger (1981–1982, Japan, animated)
  • Baxingar (1982–1983, Japan, animated)
  • Sasuraiger (1983–1984, Japan, animated)
• Jayce and the Wheeled Warriors (1985, France/Canada/Japan, animated)
• Jetsons, The (1962–1963, 1985–1987, animated)
• Jetter Mars (1977, Japan, animated)
• Jimmy Two-Shoes (2009–2011, Canada/UK/US, animated)
• Jing: King of Bandits (2002, Japan, animated)
• Johnny Test (2005–2014, animated)
• Jonny Quest (franchise):
  • Real Adventures of Jonny Quest, The (1996–1999, animated)
  • Jonny Quest vs. The Cyber Insects (1995, animated, film, New Adventures of Jonny Quest, The sequel)
  • Jonny's Golden Quest (1993, animated, film, New Adventures of Jonny Quest, The sequel)
  • New Adventures of Jonny Quest, The (1986–1987, animated, Jonny Quest sequel)
  • Jonny Quest (1964–1965, animated)
• Josie and the Pussycats in Outer Space (1972, animated)
• Journey to the Center of the Earth (franchise):
  • Journey to the Center of the Earth (1967, animated)
  • A Journey to the Center of the Earth (1977, Australia, animated) IMDb
  • Journey to the Center of the Earth (1996, Canada, animated) IMDb
  • Journey to the Center of the Earth (2001, France, animated) IMDb
• Jushin Liger (1989–1990, Japan, animated)
• Justice League (franchise):
  • Justice League (2001–2004, animated)
  • Justice League Unlimited (2004–2006, animated)
  • Young Justice (2010–2013, animated)
  • Justice League Action (2016–2018, animated)
• Jyu-Oh-Sei (2006, Japan, animated)