| Ila fengsel | Ila fengsel | Norway, Eiksmarka, Jøssingveien 33 | 2012-11-28 | -- | 2012 | 2 | |
| Ismailia Culture Palace Theatre | Ismailia Culture Palace Theatre (قصر ثقافة الإسماعيلية) | Egypt, Ismaïlia | 2006-08-22 | -- | 2006 | 1 | |
| Ingensteds | Ingensteds | Norway, Oslo, Brenneriveien 9 | 2014-12-14 | -- | 2014 | 1 | |
| Irving Place Theatre | Irving Place Theatre | United States of America, New York, East 15th Street | 1897-04-12 | 1913-11-12 | 1897–1918 | 9 | |
| Independent Theatre | Independent Theatre | Australia, North Sydney, 271 Miller Street | 1946-10-10 | -- | 1946–1951 | 2 | |
| Île-Saint-Louis-Paul Rey, Théâtre de l' | Théâtre de l'Île-Saint-Louis-Paul Rey | France, Paris, 39 quai d'Anjou | 2009-04-21 | 2009-05-24 | 2009 | 1 | |
| Intiman, Malmö Stadsteater | Intiman, Malmö Stadsteater | Sweden, Malmö, Östra Rönneholmsvägen 20 | 1954-10-08 | 2015-04-29 | 1954–2015 | 11 | |
| İş Sanat Kültür Merkezi | İş Sanat Kültür Merkezi | Turkey, Levent/İstanbul, İş Kuleleri, Büyükdere Cd., | 2010-02-28 | 2010-05-16 | 2010 | 1 | |
| Il Torrione | Il Torrione | Italy, Città di Castello, via Gramsci 28 | 2011-06-23 | -- | 2011 | 1 | |
| Intimes Theater | Intimes Theater | Switzerland, Bern | 1909-10-21 | 1909-12-01 | 1909 | 1 | |
| Instituto Português do Desporto e da Juventude | Instituto Português do Desporto e da Juventude | Portugal, Lisbon | 2023-06-05 | 2023-06-05 | 2023 | 1 | |
| Inner Stage, The, University of Guelph | The Inner Stage, University of Guelph | Canada, Guelph, 50 Stone Road East | 1990-11-25 | 1990-12-01 | 1990 | 1 | |
| Ishøj Centersal | Ishøj Centersal | Denmark, Ishøj | 2002-11-15 | -- | 2002–2004 | 2 | |
| Ianca | Ianca | Romania, Ianca | -- | -- | | | |
| Institute of Contemporary Arts | Institute of Contemporary Arts | England, London, The Mall | 1995-07-04 | 1995-07-08 | 1995 | 1 | |
| IATC Studio Cassandra | IATC Studio Cassandra | Romania, Bucharest, Str. Matei Voievod nr. 75-77 | 1957-03-15 | -- | 1957–1985 | 4 | |
| Ida Aalbergin kiertue | Ida Aalbergin kiertue | Finland | -- | -- | | | |
| Ibsenparken | Ibsenparken | Norway, Skien | 2006-05-23 | -- | 2006 | 1 | |
| Isthmus Playhouse. Madison Civic Center | Isthmus Playhouse. Madison Civic Center | United States of America, Madison, 201 State Street | 1999-10-22 | 1999-11-14 | 1999 | 1 | |
| Iran Tamasha Venue | Iran Tamasha Venue | Iran, Tehran, No 3, Semnan St., Nejat Elahi St., Ferdowsi square, Enghelab St | 2018-12-28 | -- | 2018 | 1 | |
| Irish Theatre, The | The Irish Theatre | Ireland, Dublin | 1917-04-23 | 1918-02-09 | 1917–1918 | 2 | |
| Interimstheater Brünn | Interimstheater Brünn | Czech Republic, Brno, Žerotín square | 1880-01-01 | -- | 1880 | 1 | |
| International Theatre of Tehran | International Theatre of Tehran | Iran, Tehran | 1970-- | -- | 1970 | 1 | |
| Italy | Italy | Italy, Italy | 1918-01- | 1980-03-24 | 1918–2021 | 19 | |
| Institut Papa Gueye Fall | Institut Papa Gueye Fall | Senegal, Dakar | 2021-05-19 | -- | 2021 | 1 | |
| Incognito Theatre | Incognito Theatre | England, Friern Barnet, London, Holly Park Road | 2005-02-08 | 2012-12-01 | 2005–2012 | 2 | |
| Istropolitana MDPOH | Istropolitana MDPOH | Slovak Republic, Bratislava, Ventúrska 3 | 2012-06-26 | -- | 2012 | 1 | |
| Intimiteatteri | Intimiteatteri | Finland, Helsinki, Ratakatu 9 | 1951-03-28 | -- | 1951–1962 | 3 | |
| Imperial Theatre | Imperial Theatre | England, Westminster, London, Tothill Street | 1903-01-25 | 1903-01-26 | 1903 | 2 | |
| Itaú Cultural | Itaú Cultural | Brazil, São Paulo, Avenida Paulista, 149 - Bela Vista, São Paulo - State of São Paulo, Brazil | 2022-09-29 | 2022-10-01 | 2022 | 1 | |
| Industrial space | Industrial Space | United States of America, New York, Chelsea | 1994-08- | 1995-11- | 1994 | 2 | |
| Il Piccolo Teatro Instabile | Il Piccolo Teatro Instabile | Italy, Turin, via Garessio 18 | 2004-04-24 | -- | 2004 | 1 | |
| Ithaca College Little Theatre | Ithaca College Little Theatre | United States of America, Ithaca, Ithaca College | 1952-02-28 | 1952-03-01 | 1952 | 1 | |
| 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 | |
| Islamabad | Islamabad | Pakistan, Islamabad | 2006-05-17 | -- | 2006 | 1 | |
| Intimes Theater | Intimes Theater | Germany, Nürnberg, Wolfsschlucht | 1901-01-03 | -- | 1901–1912 | 7 | |
| Iontas Theatre | Iontas Theatre | Ireland, Castleblayney Co, Monaghan, Conabury | 2007-03-09 | -- | 2007 | 1 | |
| Ibsen Theatre | Ibsen Theatre | United States of America, New York | 1935-04-01 | -- | 1935 | 1 | |
| Île, Théâtre de | Théâtre de l'Île | New Caledonia, Noumea, 161 Avenue James Cook | 2017-06-21 | 2017-06-25 | 2017 | 1 | |
| Idrettshallen, Risør | Risør idrettshall | Norway, Risør | 1975-03-17 | -- | 1975 | 1 | |
| Ironwood Opera House | Ironwood Opera House | United States of America, Ironwood | 1899-02-24 | 1899-02-24 | 1899 | 1 | |
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