| Illini Theatre Guild Laboratory Theatre, The | The Illini Theatre Guild Laboratory Theatre | 1947 – 1949 | 4 | |
| Ibsen Club, The | The Ibsen Club | 1910 – 1911 | 5 | |
| Ingun Bjørnsgaard Prosjekt | Ingun Bjørnsgaard Prosjekt | 2010 – 2014 | 5 | |
| Ibsenhuset og Grimstad bymuseum | Ibsenhuset og Grimstad bymuseum | 2003 – 2005 | 6 | |
| Interzona and La Biennale di Venezia | Interzona (Interzona and La Biennale di Venezia) | 1999 – 2000 | 6 | |
| Ibsen wo joensuru kai | Ibsen wo joensuru kai | 2006 – 2007 | 7 | |
| Ida Müller | Ida Müller | 2007 – 2012 | 8 | |
| Ibsen Performance Group | Ibsen Performance Group | 1998 – 2002 | 9 | |
| Ibsen-museet i Grimstad | Ibsen-museet i Grimstad | 2006 – 2007 | 9 | |
| Isac Fredrik Smitts sällskap | Isac Fredrik Smitts sällskap | 1877 – 1880 | 12 | |
| I Nea Skini (Konstantinos Christomanos) | I Nea Skini (Konstantinos Christomanos) | 1901 – 1904 | 13 | |
| internationale Tournée Gustav Lindemann, Die | Die internationale Tournée Gustav Lindemann | 1903 – 1904 | 13 | |
| Independent Theatre Society, The | The Independent Theatre Society | 1891 – 1897 | 13 | |
| Ida Aalberg-Tournéen | Ida Aalberg-Tournéen | 1904 | 13 | |
| International Ibsen Stage Festival | International Ibsen Stage (International Ibsen Stage Festival) | 2012 – 2013 | 16 | |
| Ibseniana-festivalen | Ibseniana-festivalen | 1989 – 2004 | 24 | |
| Ibsen-Ensemble , Das | Das Ibsen-Ensemble | 1906 | 42 | |
| Ibsen-Theater aus Berlin, Das | Das Ibsen-Theater aus Berlin | 1901 – 1912 | 60 | |
| Ibsenforbundet | Ibsenforbundet | 2004 – 2007 | 61 | |
| Internationale Tournee Maria Rehoff | Internationale Tournee Maria Rehoff | 1904 – 1912 | 85 | |
| Ibsenfestivalen | Ibsenfestivalen (Ibsen Stage Festival) (Ibsenfestivalen) | 1990 – 2020 | 549 | 3 |
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