The Annunciation, The Baptism of Christ, Madonna of the Carnation, Ginevra de' Benci, Benois Madonna, The Adoration of the Magi, St. Jerome in the Wilderness, Madonna Litta, Virgin of the Rocks, Portrait of a musician, Lady with an Ermine, Virgin of the rocks (London Version), The Last Supper, La Belle feronniere, Sala delle Assa, The Virgin and Child with St. Anne and St John The Baptist, Portrait of Isabella d'Este, The Madonna of the Yarn winder, The Virgin and Child with St. Anne, Head of a Woman, St. JOhn THe Baptist, and Vitruvian Man. 
The virgin of the rock
the last supper
the adoration of magi
the annunciation
the Madonna lita
the baptism of Christ
the Madonna of carnation


many more.

that's all I can recall.