| Indiana University Department of Theatre and Drama | Indiana University Department of Theatre and Drama | 1979 – 2019 | 3 | |
| Internationale Maifestspiele | Internationale Maifestspiele | 1954 – 2003 | 3 | |
| Illini Theatre Guild Laboratory Theatre, The | The Illini Theatre Guild Laboratory Theatre | 1947 – 1949 | 4 | |
| Independent Theatre, The | The Independent Theatre | 1946 | 1 | |
| Ibsen Society, The | The Ibsen Society | 1930 | 2 | |
| Ibsenjubileet (Ibsen Anniversary) | Ibsenjubileet (Ibsen Anniversary) | 1928 | 1 | |
| Irving Place Company | Irving Place Company | 1917 | 1 | |
| Ibsen Club, The | The Ibsen Club | 1910 – 1911 | 5 | |
| Intimes Theater | Intimes Theater | 1909 | 1 | |
| Incorporated Stage Society | Incorporated Stage Society | 1906 | 1 | |
| Ibsen-Ensemble , Das | Das Ibsen-Ensemble | 1906 | 42 | |
| Internationale Tournee Maria Rehoff | Internationale Tournee Maria Rehoff | 1904 – 1912 | 85 | |
| Ida Aalberg-Tournéen | Ida Aalberg-Tournéen | 1904 | 13 | |
| internationale Tournée Gustav Lindemann, Die | Die internationale Tournée Gustav Lindemann | 1903 – 1904 | 13 | |
| Ibsen-Theater aus Berlin, Das | Das Ibsen-Theater aus Berlin | 1901 – 1912 | 60 | |
| I Nea Skini (Konstantinos Christomanos) | I Nea Skini (Konstantinos Christomanos) | 1901 – 1904 | 13 | |
| Independent Company, The | The Independent Company | 1899 | 1 | |
| Independent Theatre Society, The | The Independent Theatre Society | 1891 – 1897 | 13 | |
| Isac Fredrik Smitts sällskap | Isac Fredrik Smitts sällskap | 1877 – 1880 | 12 | |
| Ireland Drama Festival | Ireland Drama Festival | | | |
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