I was going to say Star Wars, but they added a bunch, and it's not really a trilogy anymore. I'll go with Lord of the Rings.
What’s your favorite movie trilogy?
Starwars!!
I have two favorites ! The Mad Max Trilogy and The Godfather Trilogy.
Love all your answers, but here's one that has to be mentioned
The "Dollars Trilogy"
Harry Potter of course 😊😊
The Bourne trilogy.
James Bond 007
Lord of the Rings for the sure :)
There are several movie are so exciting, even they are so long, there are not only trilogy. But some are so boring because of they are very long with many episodes, so I seldom followed them.
Back To The Future.