| Izmail | Izmail | Ukraine, Izmail | -- | -- | | | |
| Idrettshallen | Idrettshallen | Norway, Sogndal, Lunnamyri 4 | 1971-10-22 | 1997-10-13 | 1971–1997 | 2 | |
| Ingebrigt Davik-huset | Ingebrigt Davik-huset | Norway, Brattvåg, Bernt Hildrevegen 2 | 2011-04-28 | 2014-04-01 | 2011–2014 | 2 | |
| Île, Théâtre de | Théâtre de l'Île | New Caledonia, Noumea, 161 Avenue James Cook | 2017-06-21 | 2017-06-25 | 2017 | 1 | |
| Illnau-Effretikon ZH | Illnau-Effretikon ZH | Switzerland | 2002-11-16 | -- | 2002 | 1 | |
| Iontas Theatre | Iontas Theatre | Ireland, Castleblayney Co, Monaghan, Conabury | 2007-03-09 | -- | 2007 | 1 | |
| 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 | |
| Iowa City Community Theatre | Iowa City Community Theatre | United States, Iowa City, 4261 Oak Crest Hill Rd SE | 2005-03-04 | 2005-03-20 | 2005 | 1 | |
| Ibsen Theatre | Ibsen Theatre | United States, New York | 1935-04-01 | -- | 1935 | 1 | |
| India Habitat Centre | India Habitat Centre | India, New Delhi, 94, Lodhi Road | 2017-02-19 | 2017-02-19 | 2017 | 1 | |
| Idrettshallen, Risør | Risør idrettshall | Norway, Risør | 1975-03-17 | -- | 1975 | 1 | |
| Inkonst | Inkonst | Sweden, Malmö, Bergsgatan 29 | 2006-09-29 | 2006-10-01 | 2006 | 1 | |
| Ibsenhuset | Ibsenhuset | Norway, Skien, Lundegata 6 | 1973-09-07 | 2020-09-01 | 1973–2020 | 28 | |
| Ingensteds | Ingensteds | Norway, Oslo, Brenneriveien 9 | 2014-12-14 | -- | 2014 | 1 | |
| IOGT-huset | IOGT-huset | Norway, Bergen, Sverresgate 1 | 1990-02-08 | 1990-02-14 | 1990 | 1 | |
| IGS Garbsen | IGS Garbsen | Germany, Garbsen, Meyenfelder Str. 8, | 2010-10-30 | -- | 2010 | 1 | |
| Inderøy Kulturhus | Inderøy Kulturhus | Norway, Sakshaug | 1993-03-11 | -- | 1993 | 1 | |
| Iranian Artists Forum, Entezami Hall | Iranian Artists Forum, Entezami Hall | Iran, Tehran, Iranshahr Street, Boostan Honarmandan | 2018-02-23 | 2018-02-25 | 2018 | 1 | |
| Idavoll | Idavoll | Norway, Ørsta | 1961-01-26 | -- | 1961–1963 | 2 | |
| Ibsenmuseet | Ibsenmuseet | Norway, Oslo, Henrik Ibsens gate 26 | 2002-10-02 | 2003-10-26 | 2002–2012 | 6 | |
| Idavollen | Idavollen | Norway, Ørstavik | 1952-02-29 | -- | 1952–1956 | 3 | |
| Innsjön | Innsjön | Sweden, Innsjön | 1911-07-03 | 1911-07-04 | 1911 | 1 | |
| ITA ensemble | ITA ensemble | Netherlands, Amsterdam, Leidseplein 26 | 2021-11-05 | 2021-11-13 | 2021 | 1 | |
| Indiana Repertory Theatre | Indiana Repertory Theatre | United States, Indianapolis, 140 W. Washington Street | 2001-01-09 | 2001-02-03 | 2001 | 1 | |
| Interzona | Interzona | Italy, Verona, Via Santa Teresa, 6 | 1999-10-07 | -- | 1999 | 1 | |
| International Festival of Monodrama | International Festival of Monodrama | Ukraine, Kiev | 2006-09-23 | -- | 2006 | 1 | |
| Iran | Iran | Iran, Iran | 1993-02-03 | -- | 1993–2017 | 3 | |
| Ida Aalbergin kiertue | Ida Aalbergin kiertue | Finland | 1903-- | -- | 1903–1908 | 7 | |
| Ingatestone Hall | Ingatestone Hall | England, Essex, Hall Ln | 2007-09-21 | 2021-07-02 | 2007–2021 | 3 | |
| Imperial Theatre | Imperial Theatre | United States, Saint-Louis | 1904-11-17 | 1904-11-17 | 1904 | 1 | |
| Imperial Theatre | Imperial Theatre | United States, New York, 249 W 45th St | 1924-05-01 | -- | 1924 | 1 | |
| International Theatre of Tehran | International Theatre of Tehran | Iran, Tehran | 1970-- | -- | 1970 | 1 | |
| Irazee | Irazee | United States, Irazee | -- | -- | | | |
| Iaşi | Iaşi | Romania, Iaşi | -- | -- | | | |
| Isbjørnhallen | Isbjørnhallen | Norway, Hammerfest, Meridiangata 8 | 1997-11-05 | 1997-11-06 | 1997 | 1 | |
| Istindportalen | Istindportalen | Norway, Heggelia, Kapellveien 2 | 2007-03-12 | -- | 2007 | 1 | |
| India | India | India | 1940-- | -- | 1940–1991 | 3 | |
| Iacobeni | Iacobeni | Romania, Iacobeni | -- | -- | | | |
| Iberoamericano de Teatro de Bogotá | Iberoamericano de Teatro de Bogotá | Colombia, Bogotá, Cundinamarca, Carrera 19 # 37-53 | 2008-03-07 | 2008-03-10 | 2008 | 1 | |
| International House Theater | International House Theater | United States, Chicago | 1934-03-16 | 1934-03-17 | 1934 | 1 | |
| Ibestad Samfunnshus | Ibestad Samfunnshus | Norway, Hamnvik, 9450 Hamnvik | 1970-02-28 | -- | 1970 | 1 | |
| Innsbrucker Kellertheater | Innsbrucker Kellertheater | Austria, Innsbruck, Adolf-Pichler-Platz 8 | 2004-10-20 | 2004-11-30 | 2004 | 1 | |
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