I suppose this belongs here as much as the short/avant-garde board. Quite a lot are on youtube. 

1895 Arrival of a Train (Lumiere bros) 

1901 Man with the Rubber Head (Melies) 

1902 A Trip to the Moon (Melies) 

1906 Dream of a Rarebit Fiend (Porter) 

1914 Twilight of a Woman's Soul (Bauer) 
A Child of the Big City (Bauer) 

1915 Daydreams (Bauer) 

1918 A Dog's Life (Chaplin) 

1920 One Week (Cline, Keaton) 
The Scarecrow (Cline, Keaton) 

1921 The Goat (Keaton) 
Manhatta (Strand) 

1922 Cops (Cline) 

1923 The Smiling Madame Beudet (Dulac) 
Le Retour a la Raison (Man Ray) 

1924 Entr'acte (Clair) 
Ballet Mcanique (Leger) 

1925 Jerry the Troublesome Tyke (Bilby, Griffiths) 

1926 Town Rat, Country Rat (Starewicz) 
Mnilmontant (Kirsanov) 

1928 The Seashell and the Clergyman (Dulac) 

1929 Un Chien Andalou (Bunuel) 

1932 The Music Box (Parrott) 
Betty Boop, M.D (Fleischer) 

1933 Night on Bald Mountain (Alexeieff, Parker) 
Zro de Conduite (Vigo) 
Betty Boop's Snow White (Fleischer) 
Land without Bread (Bunuel) 

1934 The Mascot (Starewicz) 
Song of Ceylon (Wright) 

1935 Composition in Blue (Fischinger) 

1936 Partie de Campagne (Renoir) 
Rose Hobart (Cornell) 
Birth of the Robot (Lye) 

1937 Clock Cleaners (Disney) 

1940 Themis (Grant) 
Swinging the Lambeth Walk (Lye) 

1943 Meshes of the Afternoon (Deren) 

1944 Jammin' the Blues (Mili) 
At Land (Deren) 

1948 Inspirace (Zeman) 

1949 Begone Dull Care (Mclaren) 

1952 Neighbours (McLaren) 

1953 White Mane (Lamorisse) 
Duck Amuck (Jones) 

1955 One Froggy Evening (Jones) 
Night and Fog (Resnais) 

1957 What's Opera, Doc? (Jones) 
Mirror Animations (H.Smith) 

1959 Astronauts (Borowczyk, Marker) 

1962 The House is Black (Farrokhzad) 

1965 The Hand (Trnka) 

1966 My Green Crocodile (Kurchevsky) 

1970 Grandmother (Lynch) 

1973 The Great Ecstasy of Woodcarver Steiner (Herzog) 

1975 Hedgehog in the Fog (Norstein) 

1977 Metamorphosis of Mr Samsa (Leaf) 

1979 Tale of Tales (Norstein) 

1980 Fly (Rofusz) 

1982 Dimensions of Dialogue (Svankmajer) 

1984 Jumping (Tezuka) 

1986 Street of Crocodiles (Quay bros) 

1988 Feelings of Mountains and Water (Te Wei) 
Sciany (Dumala) 

1989 The Cow (Petrov) 
Darkness/Light/Darkness (Svankmajer) 
Balance (Lauenstein) 
Ilha das Flores (Furtado) 

1993 The Wrong Trousers (Park) 

1996 Wind (Ivanyi) 

1997 Flatworld (Greaves) 

2000 Heart of the World (Maddin) 

2002 Lifeline (Erice) 

2006 Kiwi! (Permedi) 
Tak Tic (Boddendijk)