Does No Country for Old Men count as a western? It wasn’t my favorite movie, I’m just wondering if it would count, though.
My top 5 (In no particular order)
The Man Who Shot Liberty Vallance
The Searchers
The Wild Bunch
A Fistfull of Dollars
High Noon
All of these are great. Classic westerns, I don’t know if the genere gets better than those 5.
I would also second:
Unforgiven
The Outlaw Josey Wales
Winchester '73
Red River
The Magnificent Seven
The Good The Bad and The Ugly
&
Tombstone
As runner ups. Don’t know if Treasure of the Sierra Madre counts as a Western, but if it does throw it in there too.
Maybe throw Hondo in there somewhere also. And FWIW I like Rio Bravo better than El Dorado.
Once Upon a Time in the West is a great film
Young Guns is not a great film but it is very enjoyable.
My top ones are (in no order)
Unforgiven
The Man Who Shot Liberty Valance
Blazing Saddles
The Magnificent Seven
And although it isn’t in my top five or so, because it hasn’t been mentioned I’ll suggest The Assasination of Jesse James by the Coward Robert Ford. Great job by Casey Affleck (I know!) and Brad Pitt.
Butch Cassidy and The Sundance Kid
Shane
The Man who shot Liberty Valance
3:10 to Yuma (2007 version)
The outlaw Josey Wales
All the Scott/Boetticher films from the 50s–The Tall T, Ride Lonesome, Comanche Station, Buchanan Rides Alone–are fantastic and criminally underappreciated (though also admittedly hard to get a hold of). My favorite, though, has to be Decision at Sundown, which easily makes my Top 10 westerns ever. Others on the list:
The Wild Bunch
The Man from Laramie
Dead Man
Rio Bravo
The Wind (probably the best silent western)
McCabe & Mrs. Miller
Johnny Guitar
The Good, the Bad and the Ugly
Blazing Saddles
Plus honorable mentions to two modern incarnations: Lone Star & Brokeback Mountain.
Ooh, I forgot Lone Star. That’s a good one.
The Quick and the Dead.
It was somewhat silly, but it was fun.
Gunfight at the OK Corral was a good shoot em up.1957. It has been done a few times since.Where’s High Noon?
I like it too.
In my post, #14!
Or my post, #22!
My favorites are
Support Your Local Sheriff
Dances With Wolves
True Grit
Pale Rider
Shane
High Noon
The Searchers
Maverick (the TV shows with James Garner, not the recent movie)
Lonely are the Brave
The Missouri Breaks
Little Big Man
There Will Be Blood
Raising Arizona 
They Died With Their Boots On
The Long Riders
You can watch Little Big Man and Dances With Wolves and have an essay contest! What fun!
The Man Who Shot Liberty Valance
The Outlaw Josey Wales
High Plains Drifter
True Grit
Rooster Cogburn
The Shootist
The Cowboys
Pale Rider (Even if it does pretty much recycle the premise of High Plains Drifter)
Tombstone
A Gunfight
Jeez, a lot of depressing stuff on people’s lists.
I have almost all of John Wayne’s color westerns on DVD. My favorite, by far, is “The War Wagon.” John Wayne and Kirk Douglas. Western, action, a bit of comedy. One of your classic happy endings (Damn, too bad it was made in the days when sequels weren’t obligatory).
And the best comeback line in movie history:
(After shooting two bad guys):
Lomax (Douglas): “Mine hit the ground first.”
Taw (Wayne): “Mine was taller.”
Also, a big recommendation for “Rio Bravo” (not to be confused with “Rio Lobo”) and its remake “El Dorado”. Watch those two back-to-back and have fun comparing.
My Name Is Trinity
The good the bad and the ugly
A fistful of dollars.
Because noone does american westerns like the italians.
We recently watched two John Ford Westerns that have already been mentioned here, but I’ll second or third 'em: Stagecoach and The Man Who Shot Liberty Valance.
Stagecoach came out during an exceptionally good movie year: 1939, the same year as Gone with the Wind and The Wizard of Oz. It’s the film that catapulted John Wayne to stardom, and Thomas Mitchell – who is probably best known as Uncle Billy in It’s a Wonderful Life – won an Oscar for his role as the drunken doctor. I’d never seen it before, and even though I knew it was a classic, I was surprised how much I enjoyed it; I mean, I knew I would, but Damn! That was a good movie.
The Good, the Bad and the Ugly is a huge favorite of mine, too. As is Once upon a Time in the West. And High Noon.
OK, then, how about these…
*Cat Ballou
Paint Your Wagon*
Silverado - A loving throwback to the old good-guy/bad-guy westerns. Lawrence Kasdan knows how to put in a little bit of humor to make a story better.
The Good, the Bad, and the Ugly - It’s been a while since I’ve seen the whole thing, and it is rather long. but the payoff at the end is amazing. I get absorbed into the stories of movies, and hardly ever notice music and the use of the camera, but here it’s brilliant and unmistakeable. The frenzy of Tuco searching for a grave, and the tension of the shootout are powerful, and the characters hardly say a word.