Every Predator movie in order
To watch the Predator movies in order, start with Prey, then Predator: Killer of Killers and Predator. That's 7 out so far, about 12 hours, ending with Predator: Badlands.
The Predators have been hunting for centuries, so the story starts with Prey in 1719, long before Arnold Schwarzenegger's Predator.
Updated
The Predator movies in order
Prey
Predator: Killer of Killers
Predator
Predator 2
Predators
The Predator
Predator: Badlands
Also worth watching
AVP: Alien vs. Predator
The Aliens and the Predators meet.
Aliens vs Predator: Requiem
The sequel, set in a small American town.
Questions
What order should I watch the Predator movies in?
Start with Prey, then Predator: Killer of Killers and Predator, and follow the list above: 7 in all, ending with Predator: Badlands.
How long does it take to watch all of the Predator movies?
About 12 hours for the 7 out so far.
Do I need to watch the Predator movies in order?
No. Each one stands on its own, so start with any. Predator and Prey are the favourites.
More to watch in order
Watch the Predator movies with Chronologica
Make a plan of just the Predator movies, mark them off as you go and always know what's next. No account needed.