| IGS Garbsen | IGS Garbsen | Germany, Garbsen, Meyenfelder Str. 8, | 2010-10-30 | -- | 2010 | 1 | |
| Islington | Islington | England, London | -- | -- | | | |
| Immenstadt | Immenstadt | Germany, Immenstadt | -- | -- | | | |
| Innsbruck | Innsbruck | Austria, Innsbruck | 1946-04-27 | 1946-04-28 | 1946 | 1 | |
| Iaşi | Iaşi | Romania, Iaşi | -- | -- | | | |
| Ipswich | Ipswich | England, Ipswich | -- | -- | | | |
| Idrettsbygget | Idrettsbygget | Norway, Løkken Verk | 1969-09-17 | -- | 1969 | 2 | |
| Izmir | Izmir | Turkey, Izmir | 1903-11- | 2013-05- | 1903 - 2012 | 2 | |
| Il Torrione | Il Torrione | Italy, Città di Castello, via Gramsci 28 | 2011-06-23 | -- | 2011 | 1 | |
| Ishøj Centersal | Ishøj Centersal | Denmark, Ishøj | 2002-11-15 | -- | 2002 - 2004 | 2 | |
| Institute of Contemporary Arts (ICA) | Institute of Contemporary Arts (ICA) | England, London, The Mall | 1995-07-04 | 1995-07-08 | 1995 | 1 | |
| Intimiteatteri | Intimiteatteri | Finland, Helsinki | 1951-03-28 | -- | 1951 - 1962 | 3 | |
| 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 | |
| Ineu | Ineu | Romania, Ineu | -- | -- | | | |
| Ileana | Ileana | Romania, Ileana | -- | -- | | | |
| 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 | |
| India Habitat Centre | India Habitat Centre | India, New Delhi, 94, Lodhi Road | 2017-02-19 | 2017-02-19 | 2017 | 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 | |
| Ida Aalbergin kiertue | Ida Aalbergin kiertue | Finland | 1903-- | -- | 1903 - 1908 | 7 | |
| 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 | |
| Intimes Theater | Intimes Theater | Germany, Nürnberg, Wolfsschlucht | 1901-01-03 | -- | 1901 - 1912 | 7 | |
| 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 | |
| Illinois Theatre | Illinois Theatre | United States, Rock Island | 1904-03-15 | 1904-03-15 | 1904 | 1 | |
| Interimstheater Brünn | Interimstheater Brünn | Czech Republic, Brno, Žerotín square | 1880-01-01 | -- | 1880 | 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 | |
| Ironwood Opera House | Ironwood Opera House | United States, Ironwood | 1899-02-24 | 1899-02-24 | 1899 | 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 | |
| Isala Theater | Isala Theater | Netherlands, Capelle aan Den IJssel, Stadsplein 5 | 2009-12-22 | -- | 2009 - 2013 | 2 | |
| 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 | |
| Izmail | Izmail | Ukraine, Izmail | -- | -- | | | |
| Irazee | Irazee | United States, Irazee | -- | -- | | | |
| Illnau-Effretikon ZH | Illnau-Effretikon ZH | Switzerland | 2002-11-16 | -- | 2002 | 1 | |
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Venues
