It doesn't have to be a trilogy. Also, I'm going by release order, not chronological order.

Part 1 - Jaws
Part 2 - Empire Strikes Back
Part 3 - Infinity War

Part 1 - Raiders of the Lost Ark
Part 2 - Empire Strikes Back
Part 3 - Dare I say, Toy Story 3?

Part 1 - Back to The Future
Part 2 - Empire Strikes Back
Part 3 - Last Crusade

BenTheGoodAg said:

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Part 1 - Raiders of the Lost Ark
Part 2 - Empire Strikes Back
Part 3 - Dare I say, Toy Story 3?

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Toy Story 3 is a great answer. Outstanding movie.

1. Star Wars: The Phantom Menace
2. Star Wars: The Last Jedi
3. The Hobbit: The Battle of the Five Armies

Part 1: Rocky
Part 2: Empire
Part 3: LOTR Return of the King

Part 1: Die Hard
Part 2: The Dark Knight
Part 3: Last Crusade

1 - Back to the Future
2 - Back to the Future
3 - Back to the Future

1A. Fellowship of the Ring 1B. Back to the Future
2A. Terminator 2 2B. Empire Strikes Back
3. Return of the King

Part 1: Godfather
Part 2: Empire
Part 3: Return of the King

It's hard to remember.m Godfather had a part 3 because it was such a step down in quality, but Godfather 1 is such an incredible movie.

And just to expand the discussion beyond the obvious, some really good third movies...

Nightmare on Elm Street: Dream Warriors
Friday the 13th: Part III (Not the best sequel, but pretty fun. First appearance of the iconic hockey mask.)
Back to the Future: Part III (This movie is a ton of fun. Will not hear otherwise.)
Mission: Impossible III
Before Midnight
Die Hard With a Vengeance
Thor: Ragnarok
The Bourne Ultimatum
Skyfall
John Wick: Chapter 3

Would add Captain America: Civil War as the 3rd movie in the Captain America series.
And for a western, The Good, the Bad and the Ugly is the best of that trilogy.




For my list (Only initials needed since they have all been mentioned multiple times)

1. BttF
2. ESB
3. LotR: RotK

David Happymountain said:

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1. Star Wars: The Phantom Menace
2. Star Wars: The Last Jedi
3. The Hobbit: The Battle of the Five Armies

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Part 1: Godfather
Part 2: Empire
Part 3: Die Hard with a Vengeance

Lots of good 2's and I can't really choose:

Empire
T2
Godfather 2
Rambo
Aliens

Great 3s:

Last Crusade
MI 3
Rocky III -- "Hey, Woman"
Return of the King

Paddington 2

The Godfather 3 movie DVD set is awesome! 2 of the greatest movies of all time, along with a commemorative coaster for your beer.

1. The Matrix
2. Top Gun 2
3. Return of the King

1 - Raiders of the Lost Ark
2 - The Empire Strikes Back
3 - Indiana Jones and the Last Crusade

would consider Alien, Back to the Future, Die Hard, and The Lord of the Rings: The Fellowship of the Rings for 1.
would consider Captain America: The Winter Soldier, Aliens, and Rocky II for 2.
would consider Avengers: Infinity War for 3.

Bttf
Tdk
Rotk