| Name (742) | Creators | Event Dates | Events | Resources |
|---|---|---|---|---|
| Iphigenia in Aulis | Euripides | 1966 - 2014 | 10 | |
| Iphigenia in Aulis | Christoph Gluck | 1916 - 2013 | 3 | |
| Iphigenia in Tauris | Christoph Gluck | 1951 - 2007 | 6 | |
| Iphis | Elena Kats-Chernin, Richard Toop | 2022 | 1 | |
| Iranian Nights | Howard Brenton, Tariq Ali | 1990 | 1 | |
| Ireland As It Was | 1870 | 1 | ||
| Irene | Harry Tierney, James Montgomery, Joseph McCarthy | 1920 - 2020 | 12 | |
| Irene | Charles Gounod, Henry Brougham Farnie, Jules Barbier, Michel Carré | |||
| Irene, "Far Greater in his Lowly State" | Charles Gounod, Henry Brougham Farnie, Jules Barbier, Michel Carré | 1907 - 1944 | 2 | |
| Irene, "Lend Me Your Aid" | Charles Gounod, Henry Brougham Farnie, Jules Barbier, Michel Carré | 1912 | 1 | |
| Irene, "Marche Cortege" | Charles Gounod, Henry Brougham Farnie, Jules Barbier, Michel Carré | 1903 - 1908 | 2 | |
| Iris | Arthur Wing Pinero | 1923 | 1 | |
| Irish at Heart | Helen Wyngard | 1998 | 1 | |
| The Irish Boy and Yankee Girl | 1869 | 2 | ||
| The Irish Emigrant | 1870 | 1 | ||
| Irish Folk Song | Arthur Foote | 1913 | 2 | |
| Irish Jig | 1845 | 1 | ||
| The Irish Lion | 1850 | 2 | ||
| Irish Melodies | Charles Woodhouse | 1955 | 1 | |
| The Irish Physician | 1850 | 2 | ||
| The Irish Serenade | 1854 | 2 | ||
| Irish Songs, WoO 153, No.16, "O Might I but my Patrick love" | Ludwig van Beethoven | 1945 | 1 | |
| Irish Stew | John Bradley | 1979 | 1 | |
| The Irish Tiger! | 1869 - 1871 | 2 | ||
| Irish Tune from Country Derry | Percy Grainger | 1949 - 1990 | 3 | |
| The Irish Tutoe; or, New Lights | Richard Butler | 1834 | 1 | |
| Irish Tutor | 1849 - 1856 | 12 | ||
| The Irish Widow | David Garrick | 1800 | 1 | |
| The Irishman in London; or, The Happy African | William Macready | 1833 - 1835 | 6 | 1 |
| Irkanda I | Peter Sculthorpe | 2017 | 2 | |
| Irkanda III | Peter Sculthorpe | 2017 | 1 | |
| Irkanda IV (1989) | Peter Sculthorpe | 1996 - 2003 | 2 | |
| IRL | Lewis Treston | 2025 | 1 | |
| Irma La Douce | Alexandre Breffort, Marguerite Monnot | 1958 - 1986 | 10 | |
| The Iron Chest | George Colman | 1837 | 1 | |
| The Iron Man | Jim Vile, Malcolm Fox, Sue Rider | 1987 | 1 | |
| Ironbound | Martyna Majok | 2024 | 1 | |
| Irony Is Not Enough | Anne Carson | 2009 - 2010 | 2 | |
| The Irregular Verb to Love | Hugh Williams, Margaret Williams | 1963 | 1 | |
| The Irresistible | Adriane Daff, Tim Watts, Zoe Pepper | 2019 | 1 | |
| Irresistible Divide | Lucy Guerin | 1990 | 1 | |
| Is a Girl to Blame | Owen Davis | 1920 | 1 | |
| A is for Apple | Jessica Bellamy | 2022 | 1 | |
| Is God Is | Aleshea Harris | 2023 | 2 | |
| Is he Jealous? | Samuel Beazley | 1836 | 1 | |
| Is Life Worth Living | Lennox Robinson | 1956 | 1 | |
| Is My Lipstick on Straight? | Susan Prince | 2015 | 1 | |
| Is My Team Ploughing? | George Butterworth | 1956 | 1 | |
| Is She a Woman? | 1837 - 1847 | 3 | ||
| Is She Guiltless? | Arthur Shirley | 1901 | 7 | |
| Is That You Nancy? | Sandra Shotlander | 1991 | 1 | 2 |
| Is There Something Wrong with That Lady | Debra Oswald | 2021 - 2023 | 2 | |
| Is This Thing On? | Zoe Coombs Marr | 2014 - 2018 | 2 | |
| Is This Where We Came In? | Mil Perrin | 1981 - 1987 | 3 | 2 |
| Is Your Honeymoon Really Necessary? | EV Tidmarsh | 1950 | 1 | |
| Is Zat So? | James Gleason, Richard Taber | 1926 - 1927 | 5 | |
| Isabel of Valois | Henry O'Flaherty | 1842 | 1 | 1 |
| Isabella's Room | Needcompany | 2006 | 1 | |
| Isabelle | Elisabeth Burke, Pierre Thibaudeau, Entr'acte Theatre Limited, Sydney Corporeal Mime Theatre | 1980 | 1 | |
| Isabelle; or, Woman's Life | John Baldwin Buckstone | 1836 | 1 | |
| Isadora's Tribe | Bert van Dijk | 1992 - 1998 | 6 | |
| ISAM | Amon Tobin | 2012 | 1 | |
| Ishmael and The Return of the Dugongs | Michael Gerard Bauer | 2011 | 1 | |
| The Ishmael Club | Bill Garner, Sue Gore | 2003 - 2004 | 2 | |
| Isidora | Luscombe Searelle | 1885 | 1 | |
| Islamey | Mily Balakirev | 1953 - 1989 | 3 | |
| The Island | Lano and Woodley | 2004 - 2005 | 7 | |
| The Island | Athol Fugard | 1973 - 2003 | 11 | |
| The Island | Merton Hodge | 1939 | 1 | |
| Island | Entr'acte Theatre Limited | 1980 - 1981 | 4 | |
| The Island | Armin Greder | 2011 | 1 | |
| The Island of Aphrodite | Alexis Parnis | 1980 | 1 | |
| The Island of Doctor Moreau | H G Wells | 2016 | 1 | |
| Island of Palms | Margery Browne | 1935 | 1 | |
| The Island of Slaves | Pierre Carlet de Chamblain de Marivaux | 2005 | 1 | |
| Isle of Swans | Daniel Keene | 1985 - 1987 | 3 | |
| The Isle of the Dead, Op. 29 | Sergei Rachmaninoff | 2012 | 1 | |
| The Isle, Op. 14, No. 2 | Sergei Rachmaninoff | 1948 - 2009 | 5 | |
| Isn't it Pathetic at His Age | Barry Humphries | 1978 | 1 | |
| Isobel, H. 102 | Frank Bridge | 1947 - 1958 | 3 | |
| Israel in Egypt, HWV 54 | George Frideric Handel | 1948 - 2016 | 6 | |
| Israel in Egypt, HWV 54, "The Lord is a Man of War" | George Frideric Handel | 1909 - 2001 | 2 | |
| Issues Addressed | Brett Murphy | 1985 | 1 | |
| IsThere Something Wrong With That Lady? | Debra Oswald | |||
| It All Begins With Love | Rod Ainsworth | 2015 | 1 | |
| It Bleeds It Sleeps | Fools Gallery Theatre Company | 1981 | 2 | |
| It Can Damage Your Health | Eric Chappell | 2005 | 1 | |
| It Could Be Any One of Us | Alan Ayckbourn | 2007 - 2017 | 4 | |
| It Just Stopped | Stephen Sewell | 2006 - 2014 | 4 | |
| It Never Rains But - | Myrna Dickey | 1933 | 1 | |
| It Pays To Advertise | Roi Cooper Megrue | 1916 - 1929 | 7 | |
| It Rains on the Road | Catherine Shepherd | 1 | ||
| It Runs in the Family | Ray Cooney | 1960 | 3 | |
| It Shoulda Been You | Barbara Anselmi, Brian Hargrove | 2017 | 1 | |
| It Sounds Silly | Chunky Move Dance Company | 2011 | 1 | |
| It Sounds Silly... | 2nd Toe Dance Collective | 2010 | 1 | |
| It Takes a While to Know One | Jennifer Compton, Nimrod | 1976 | 2 | |
| It was a time when silly bees could speak | John Dowland | 1995 | 1 |