Hmm, I could list The best ten foreign silent films I've seen, but it wouldn't be appropriate, as I haven't seen ten that would deserve to be in such a listing. I know I am in the minority here, but I don't regard several films high enough which many claim to be masterpieces (e.g. Battleship Potemkin, Metropolis, Nosferatu, The last Laugh, Arsenal, to name but a few). And I'm not able to judge some other, rather unknown films which I've seen too long ago, but which i liked very much at that time. Sadly, with such movies one can only HOPE for an opportunity to see them again... 
It's a shame that there are still far too little silent films out on DVD.

Instead I will offer a general Top Ten consisting of my favorite silents which I would urge anyone to watch. I promise to kick out the english-"language" ones, when I see more foreign masterpieces.

1. City Lights (Charles Chaplin / USA / 1931)
2. un chien andalou An Andalusian Dog (Salvador Dali, Luis Bunuel / France / 1928) 
3. The Wind (Victor Sjostrom / USA / 1928) 
4. The Gold Rush (Charles Chaplin / USA / 1925)
5. Intolerance: Love's Struggle Through the Ages (David Wark Griffith / USA / 1916)
6. Shoulder Arms (Charles Chaplin / USA / 1918) 
7. Die Bergkatze The Wildcat (Ernst Lubitsch / Germany / 1921)
8. Das Kabinett des Doktor Caligari The Cabinet of Dr. Caligari (Robert Wiene / Germany / 1920) 
9. Our Hospitality (Buster Keaton, John G. Blystone / USA / 1923)
10. Greed (Erich von Stroheim / USA / 1924)