| Il Piccolo Teatro Instabile | Il Piccolo Teatro Instabile | Italy, Turin, via Garessio 18 | 2004-04-24 | -- | 2004 | 1 | |
| Idrettshallen | Idrettshallen | Norway, Sogndal, Lunnamyri 4 | 1971-10-22 | 1997-10-13 | 1971 - 1997 | 2 | |
| Iacobeni | Iacobeni | Romania, Iacobeni | -- | -- | | | |
| Ianca | Ianca | Romania, Ianca | -- | -- | | | |
| Ila skole | Ila skole | Norway, Oslo, Fougstads gate 10 | 2005-11-04 | -- | 2005 | 1 | |
| Ibsenmuseet | Ibsenmuseet | Norway, Oslo, Henrik Ibsens gate 26 | 2002-10-02 | 2003-10-26 | 2002 - 2012 | 6 | |
| Ithaca College Little Theatre | Ithaca College Little Theatre | United States, Ithaca, Ithaca College | 1952-02-28 | 1952-03-01 | 1952 | 1 | |
| International Festival of Monodrama - Die Pumpe | International Festival of Monodrama - Die Pumpe | Germany, Kiel | 2006-11-11 | -- | 2006 | 1 | |
| Istindportalen | Istindportalen | Norway, Heggelia, Kapellveien 2 | 2007-03-12 | -- | 2007 | 1 | |
| International Theatre | International Theatre | United States, New York | 1946-11-12 | 1947-02-19 | 1946 | 1 | |
| Inkonst | Inkonst | Sweden, Malmö, Bergsgatan 29 | 2006-09-29 | 2006-10-01 | 2006 | 1 | |
| Intima Teatern | Intima Teatern | Sweden, Stockholm, Barnhusgatan 20 | 1912-11-01 | 1919-03-14 | 1912 - 1919 | 3 | |
| Intimní scéna | Intimní scéna | Czech Republic, Tábor | 1924-12-18 | -- | 1924 | 1 | |
| Idrettshallen på Tråstad skole | Idrettshallen på Tråstad skole | Norway, Kongsvinger | 1971-09-29 | 1971-09-29 | 1971 | 1 | |
| Illinois Theatre | Illinois Theatre | United States, Chicago, 65 E. Jackson Boulevard | 1908-01-31 | -- | 1908 - 1927 | 2 | |
| Intiman Theatre | Intiman Theatre | United States, Seattle, 201 Mercer Street | 1996-12-08 | 2012-08-25 | 1996 - 2012 | 4 | |
| Ingensteds | Ingensteds | Norway, Oslo, Brenneriveien 9 | 2014-12-14 | -- | 2014 | 1 | |
| Intiman, Malmö Stadsteater | Intiman, Malmö Stadsteater | Sweden, Malmö, Östra Rönneholmsvägen 20 | 1954-10-08 | 2012-11-01 | 1954 - 2012 | 10 | |
| Independent Theatre | Independent Theatre | Australia, North Sydney, 271 Miller Street | 1946-10-10 | -- | 1946 - 1951 | 2 | |
| International Theatre of Tehran | International Theatre of Tehran | Iran, Tehran | 1970-- | -- | 1970 | 1 | |
| Imperial Theatre | Imperial Theatre | United States, Saint-Louis | 1904-11-17 | 1904-11-17 | 1904 | 1 | |
| Incognito Theatre | Incognito Theatre | England, Friern Barnet, London, Holly Park Road | 2005-02-08 | 2012-12-01 | 2005 - 2012 | 2 | |
| Italy | Italy | Italy, Italy | 1919-09-01 | -- | 1919 - 1973 | 5 | |
| İş Sanat Kültür Merkezi | İş Sanat Kültür Merkezi | Turkey, Levent/İstanbul, İş Kuleleri, Büyükdere Cd., | 2010-02-28 | 2010-05-16 | 2010 | 1 | |
| IOGT-huset | IOGT-huset | Norway, Bergen, Sverresgate 1 | 1990-02-08 | 1990-02-14 | 1990 | 1 | |
| Ibsenhuset | Ibsenhuset | Norway, Skien, Lundegata 6 | 1973-09-07 | 2015-11-18 | 1973 - 2017 | 26 | |
| Imperial Theatre | Imperial Theatre | United States, New York, 249 W 45th St | 1924-05-01 | -- | 1924 | 1 | |
| Istropolitana MDPOH | Istropolitana MDPOH | Slovak Republic, Bratislava, Ventúrska 3 | 2012-06-26 | -- | 2012 | 1 | |
| Irazee | Irazee | United States, Irazee | -- | -- | | | |
| Illnau-Effretikon ZH | Illnau-Effretikon ZH | Switzerland | 2002-11-16 | -- | 2002 | 1 | |
| Ivano-Frankivsk | Ivano-Frankivsk | Ukraine, Ivano-Frankivsk | 1907-03- | 1907-04- | 1907 | 1 | |
| Island Arts Centre | Island Arts Centre | Northern Ireland, Lisburn, Lagan Valley Island | 2011-04-11 | -- | 2011 - 2018 | 2 | |
| Indiana Repertory Theatre | Indiana Repertory Theatre | United States, Indianapolis, 140 W. Washington Street | 2001-01-09 | 2001-02-03 | 2001 | 1 | |
| Idrettshallen | Idrettshallen | Norway, Kautokeino | 1997-10-31 | -- | 1997 | 1 | |
| Idrettshuset | Idrettshuset | Norway, Straumsnes | 1956-02-08 | -- | 1956 - 1963 | 3 | |
| Innsbrucker Kellertheater | Innsbrucker Kellertheater | Austria, Innsbruck, Adolf-Pichler-Platz 8 | 2004-10-20 | 2004-11-30 | 2004 | 1 | |
| Inderøy kulturhus | Inderøy kulturhus | Norway, Inderøy, Vennalivegen 15 | 2001-06-25 | -- | 2001 - 2006 | 2 | |
| IATC/UNATC ( National University of Theatre and Film "I.L. Caragiale") | IATC/UNATC ( National University of Theatre and Film "I.L. Caragiale" ) | Romania, Bucharest, Matei Voievod Street 75-77 | 1907-05-26 | 1907-05-27 | 1907 - 2015 | 9 | |
| Idavollen | Idavollen | Norway, Ørstavik | 1952-02-29 | -- | 1952 - 1956 | 3 | |
| IATC Studio Cassandra | IATC Studio Cassandra | Romania, Bucharest, Str. Matei Voievod nr. 75-77 | 1957-03-15 | -- | 1957 - 1985 | 4 | |
| Ibsenparken | Ibsenparken | Norway, Skien | 2006-05-23 | -- | 2006 | 1 | |
| International House Theater | International House Theater | United States, Chicago | 1934-03-16 | 1934-03-17 | 1934 | 1 | |
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Venues
