Ken Washio may refer to the below characters who share the same name and the role as leader of the Science Ninja Team, but differ across the various forms of Gatchaman media:
- Ken Washio (Classic), the original incarnation existing in Science Ninja Team Gatchaman, II, and Fighter. This version also appears in Hisayuki Toriumi's SF Roman Science Ninja Team Gatchaman, and tends to be the "Ken" you usually see in cameos in other Tatsunoko works.
- Ken Washio (The Condor Flies), the re-imagined version in Jinzo Toriumi's Novel Science Ninja Team Gatchaman: The Condor Flies.
- Ken Washio (OVA), the version existing in the 1994-1995 Gatchaman OVA and its light novels.
- Ken Washio (2013), the version in the 2013 Gatchaman live-action movie.
- Ken Washio (Infini-T Force), a version branching from the original series that exists in Infini-T Force.