| An Implausible Claus |   |
| An Irish Play | |
| I Ain't Yo' Uncle: The New Jack Revisionist Uncle Tom's Cabin | |
| I Have Before Me a Remarkable Document Given to Me by a Young Lady From Rwanda | |
| I Just Stopped By to See the Man | |
| I Know I Saw Gypsies | |
| I Never Saw Another Butterfly | |
| I Never Saw Another Butterfly (musical) | |
| I Never Saw Another Butterfly (one act) | |
| I Saved a Winter Just for You | |
| I Was a Teen-age Dracula | |
| I Will Sing Life: Voices From the Hole in the Wall Gang Camp | |
| I'll Fly Away | |
| I'm a Family Crisis | |
| I'm a Stranger Here Myself | |
| I've Hit an Iceberg | |
| If Boys Wore the Skirts (Non-royalty) | |
| If Girls Asked Boys for Dates (Non-royalty) | |
| If It's Monday, This Must Be Christmas! | |
| If It's Monday, This Must Be Murder! | |
| If the Shoe Fits | |
| Importance of Being Earnest, The (Clark) | |
| In Space | |
| In the Company of Sinners and Saints | |
| In the Garden of Live Flowers | |
| In the Garden of the Selfish Giant | |
| In the Middle of Grand Central Station | |
| In the Middle of Nowhere | |
| In the Tank | |
| Inadmissible Evidence | |
| Inside Out-Upside Down (manuscript) | |
| Interrupting Vanessa | |
| Inventing Montana | |
| Iron Kisses | |
| Iron Kisses (Beses de Hierro - Spanish manuscript) | |
| It Happens Every Summer | |
| It's a Slippery Slope | |
| It's a Wonderful Life | |
| It's a Wonderful Life (radio manuscript) | |
| It's Murder in the Wings! | |
| The Ice Wolf | |
| The Illustrated Woman | |
| The Imaginators | |
| The Inexperienced Ghost | |
| The Informer | |
| The Initiation | |
