Crusader Zombies are a type of zombie that appear in the Zombies map Origins. Just like the Templar Zombies, they're an ancient version of the standard zombie, probably dating back to the days of the Crusades due to their names.
Their uniforms are similar to the Templar Zombies' uniforms but have a different color and symbol on them. They can either be all white with a red symbol on the chest, or be in an altering pattern of red and white all over. The center of the crosses on their chests contain a smaller version of the symbol seen on the chests of the Templar Zombies. They also come with either a small pouch and/or a sheathed sword attached to their belts and some have beards while others don't. In the intro their eyes are a purplish white color. In Black Ops II, they gain blue eyes, while in Black Ops III, they retain the normal orange eyes that the rest of the Zombies possess.
Crusader Zombies only spawn in the "Staff Tunnels" and under the "Pack-a-Punch" in the Excavation Site. When they spawn they can join in with a horde of standard zombies.