French
-Weekend: Will always be my favorite french film, possibly from all of continental Europe. The only other Godard films I've seen are...
-Hail Mary: Either so subtle I didn't get it, or just plain boring.
-Alphaville: A neat Orwellian/Film Noir/Sci-fi satire...I think. I recall that one like a fever dream.
Spanish (I think)
-El Topo: Favorite western of me who hates westerns.
Japanese
Uzumaki: If they could have just played "The Spiralling Shape" by They Might Be Giants over the end credits, it woulda been perfect.
7 Samurai was good too. Just be prepared to split it between 2 evenings if necessary. I'm not well versed in Kurosawa.
German
Metropolis: I still haven't seen the remaster from the vault a few years ago, but I must stick up for the cut Giorgio Moroder did in the '80s. Everyone b*****s him out for doing a pop-music/synth score, forgetting that the original score was lost and therefore HAD to be replaced, he was the only person to actually set ANY original music to it (I've watched a public domain version with random music from Carmen slapped on at the least appropriate places - *BARF*), that score is actually kind of appropriate for the first true science fiction film, and he actually bothered to restore it and briefly GET IT BACK INTO THEATRES!"
So buy the bootleg if you havta' (After you buy the legit version, of course...), but pay Moroder respect for keeping Lang in the public eye.
The Cabinet of Doctor Caligari: The first horror film was also the first German-Expressionist film (the category into which Metropolis also falls)
M: Does anyone else think certain parts of Death Note were subtly inspired by this movie?
Italian
IMO, the OP's criteria sort of stumble here, since most Italian movies are shot under the assumption that they'll be dubbed into every language, including italian, with actors from all different countries speaking their respective languages during filming. Therefore, out of all my favorite Argento and Fulci films, only The Beyond arbitrarily fits the bill, since Rolling Thunder's release happened to include italian audio with subs as an option. They're untrustworthy DUBtitles too, which defeats the whole point.
However, I must mention Deep Red, the Anchor Bay release for which randomly alternates between english and italian w/sub, since english audio was lost for all the scenes cut for American theatrical release. Sadly, there's no all italian w/sub option, so it's really jarring, and sad, since that's my all time favorite murder mystery, favorite romantic comedy, and was the bloodiest movie ever made back in '74. Hope they do a full-sub release someday, but considering the generic tripe most American horror fans scarf down today, I'm not holding my breath.
_________________
No one in the world ever gets what they want,
and that is beautiful.
Everybody dies frustrated and sad,
and that is beautiful.
-TMBG