The scene in Anna's apartment where Holly is drunk and trying to woo her, especially where she laughs. but only once. That scene gets me every time.

Probably Welles' introduction.
#MakeFilmGeneralGreatAgain

Definitely the very tense Riesenrad (ferris wheel) scene. I rode on it when I was in Vienna in 2013, and it really goes up high!
Second favorite scene is Harry Lime's amazing entrance in that doorway. I had my picture taken in that same doorway when I was in Vienna.
Amazing film, amazing city!
Schrodinger's cat walks into a bar, and / or doesn't.

The whole chase sequence in the sewers. Even after 65 years, it's still as intense and exciting as anything from today. I remember watching it in school and secretly hoping Harry Lime would somehow escape. The charm of evil I guess.
But my favorite image from that whole sequence would be this
http://thefifiorganization.net/2014site/wp-content/uploads/2014/10/third_grateabove.jpg
~ I'm a 21st century man and I don't wanna be here.

The final scene and the scene where Holly comes out after killing Harry.

Either the Ferris wheel scene, or the final sewer scene just for the excellent cinematography.

Silly little one, but where a drunken Holly looks like he is about to hit the officer and the sergeant steps in , casually hits him on the chin knocking him down, then immediately helps him up , dusting him down saying "Do take care sir" as though he had fallen down himself.

1. The Ferris Wheel scene when Harry was talking about "what if one of those dots stopped moving", and when Holly felt the need to grab onto something.
2. The final scene.
3. Holly speaking to the literary club.

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1. The Ending
2. "come out come out whoever you are" Lime appears
3. Cuckoo clock, leonardo da vinci

That giant shadow on the wall as a figure approaches.

Yes, thank you! "Poetic" is the perfect way to describe that final scene.
Not only the idea of the good guy not getting the girl and her unwavering loyalty to the bad guy, but the creative execution - with that extra long take and the isolation of the surroundings - really builds up, delivers, and makes linger such an emotional impact. And this is the second time I saw a similar idea, the first being Scorsese's homage in
The Departed
, but that one doesn't feel as "shattering" or "awe-inspiring".
EDIT: Maybe it's because the moralities of the characters are reversed in
The Departed
, but in that context I still did not feel that strong an "Oh snap!" effect.
This is up there in my list of favorite closing moments in film, with
The Graduate
. That one's equally harrowing and evocative, and unscripted to boot!

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This film contains two of the greatest scenes in film history: Lime's entrance and the final shot. Although the former is the most iconic, I'd have to say the latter is my favorite because of its emotional impact. It's one of the most brilliant, poetic, beautiful, truthful, moving.simply the most perfect scene ever filmed. I've seen the film a dozen times and it leaves me utterly shattered and in awe every viewing.

When Harry Lime is revealed standing in the doorway with an enigmatic smile on his face, lit up by a lamp as he comes out of the shadow.

The last shot.
That's my favorite scene, too.
My real name is Jeff

The last shot.

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That scene with his cat at his feet and Lime's face being lit up . and then he disappears as the taxi drives past that doorway . It gives me goose bumps.

Orson Welles coo coo clock speech at the end of the Ferris wheel scene is classic.
What are you gonna do? Kill me? Every body Dies. John Garfield (Body and Soul)

The Ferris Wheel. Such great dialogue. Excellent characterization: Harry Lime becomes a complex and captivating character in just one scene of dialogue. Great cinematography. And of course, the whimsical setting of an amusement park ride paradoxically paired with a conversation about the value of human life. Genius.
When you have to shoot- shoot, don't talk -Tuco Benedicto Pacifico Juan Maria Ramirez