The Cult of Nostradamus was an evil doomsday cult and the main antagonists of the 1988 Ninja Gaiden arcade game which is known as Ninja Ryūkenden in Japan and Shadow Warriors in Europe. The cult was led by Bladedamus, supposed descendant of famous French seer Nostradamus with the goal of bringing about the end of the world.
- Bladedamus: Leader of the cult and descendant of Nostradamus.
- The Dragons: A tag-team wrestling duo working with the cult.
- Sumo: A strong sumo wrestler.
- Masked Clawmen: Teams of masked, acrobatic, claw-wielding maniacs.
- Ninja: Ninja working with the cult.
- Masked Psychos: Knuckle duster-wielding, hockey mask-wearing psychopaths.
- Escrima Stick Users: Buff, bearded stick fighters.
- Martial Artists: Masked martial artists.
- Strong Men: Large men carrying logs.
- Spearmen: Spear wielding soldiers.
- Bikers: Bike riding gang members working for the cult.
- Water Monsters: Monsters from the river that reach out and attack.