| I bianchi ed i negri | September 22, 1863 | — | Paolo Giorza |
| I due soci | January 20, 1863 | — | Peter Ludwig Hertel |
| I prati di Jalu | — | — | Michele Eulambio |
| I riti indiani | — | — | Wenzel Robert von Gallenberg |
| I sette peccati | April 24, 1956 | — | Antonio Veretti |
| I'm Old Fashioned | June 16, 1983 | Jerome Robbins | Morton Gould |
| IIris | — | Philippe Decouflé | Claire Diterzi |
| Il ballo delle ingrate | June 4, 1608 | — | Claudio Monteverdi |
| Il carillon magico | September 19, 1918 | — | Riccardo Pick-Mangiagalli |
| Il castello nel bosco | January 24, 1931 | — | Franco Casavola |
| Il convento veneziano | February 7, 1925 | — | Alfredo Casella |
| Il diavolo a quattro | 1928 | — | — |
| Il diavolo si diverte | October 26, 1939 | — | Vincenzo Tommasini |
| Il giardino delle carezze | — | — | Piero Coppola |
| Il noce di Benevento | April 25, 1812 | — | — |
| Il ragazzo e la sua ombra | January 18, 1966 | — | Renzo Rossellini |
| Il salice d'oro | January 27, 1914 | — | Riccardo Pick-Mangiagalli |
| Illuminations | — | Frederick Ashton | Benjamin Britten |
| Imagined Wing | October 30, 1944 | Martha Graham | — |
| Impressing the Czar | October 1, 1988 | William Forsythe | Ludwig van Beethoven, Tom Willems |
| In Creases | — | Justin Peck | Philip Glass |
| In Memory Of ... | — | Jerome Robbins | Alban Berg |
| In the Blue | — | Anna Lærkesen | Johannes Brahms |
| In Vento | May 4, 2006 | Mauro Bigonzetti | Bruno Moretti |
| Incense Shadows | — | — | Aaron Avshalomov |
| Inner Page | January 31, 1979 | Aimé De Lignière | William Russo |
| Invito a nozze | February 1978 | — | Lorenzo Ferrero |
| Iphigenia in Tauris | January 16, 1991 | Nina Winthrop | John Cale |
| Isadora | December 28, 1976 | Maurice Béjart | — |
| Istar | — | — | Bohuslav Martinů |
| Ivesiana | — | George Balanchine | Charles Ives |