| Illamola, Mireia | Mireia Illamola | Actor | 2015 | 1 | |
| Ivanova, Eleonora | Eleonora Ivanova (Елеонора Иванова) | Actor | 2022 | 1 | |
| Iić, Sima | Sima Ilić (Сима Илић) | Actor | 1923 | 1 | |
| Ilić, Draga | Draga Ilić (Драга Илић) | Actor | 1923 - 1934 | 2 | |
| Iparraguirre, Iván | Iván Iparraguirre | Actor, Adaptation, Director | 2006 | 3 | 1 |
| Iniwa, Takashi | Takashi Iniwa (Takashi Iniwa) | Actor, Adaptation, Director, Translator | 1912 - 1914 | 7 | |
| Iacov, Adrian | Adrian Iacov | Actor, Assistant Director | 2010 | 8 | |
| Ingólfsson, Lárus | Lárus Ingólfsson (Lárus Ingólfsson) | Actor, Costume Designer, Designer | 1942 - 1965 | 13 | |
| Irving, Laurence | Laurence Irving (Laurence Irving) | Actor, Costume Designer, Designer | 1894 - 1955 | 8 | 1 |
| Ignat, Diana | Diana Ignat | Actor, Dancer | 2005 | 3 | |
| Iacob, Gabriela | Gabriela Iacob | Actor, Dancer | 2005 | 3 | |
| Ireys, John | John Ireys | Actor, Dancer | 1940 | 6 | |
| Ivey, Derrick | Derrick Ivey | Actor, Designer | 2003 - 2006 | 2 | 1 |
| Iliff, Noel | Noel Iliff | Actor, Designer, Director, Producer | 1931 - 1938 | 8 | |
| Inness, Jean | Jean Inness (Jean Inness) | Actor, Director | 1934 - 1935 | 3 | |
| Ipsen, Bodil | Bodil Ipsen (Bodil Ipsen) | Actor, Director | 1924 - 2004 | 20 | 1 |
| Indriðadóttir, Guðrún | Guðrún Indriðadóttir (Guðrún Indriðadóttir) | Actor, Director | 1905 - 1927 | 6 | |
| Ikonomov, Matej | Matej Ikonomov (Matej Ikonomov) | Actor, Director | 1898 - 1915 | 8 | |
| in der Au, Ottomar | Ottomar in der Au (Ottomar in der Au) | Actor, Director | 1946 | 2 | |
| Isefiær, Ellen | Ellen Isefiær (Ellen Isefiær) | Actor, Director | 1928 - 2006 | 26 | 3 |
| Ivarson-Moe, Anna | Anna Ivarson-Moe (Anna Ivarson-Moe) | Actor, Director | 1919 - 1928 | 11 | 1 |
| Ichikawa, Ennosuke | Ennosuke Ichikawa (Ennosuke Ichikawa) | Actor, Director | 1913 - 1922 | 3 | |
| Ivarson, Victor | Victor Ivarson (Victor Ivarson) | Actor, Director | 1923 - 1928 | 6 | 1 |
| Ilmari, Vilho | Vilho Ilmari | Actor, Director | 1928 - 1954 | 6 | |
| Igar, Stanisław | Stanisław Igar | Actor, Director | 1957 - 1975 | 2 | |
| Iordănescu, Ştefan | Ştefan Iordănescu | Actor, Director | 1970 - 1998 | 6 | |
| Ioannou, Styliana | Styliana Ioannou | Actor, Director | 2017 - 2018 | 4 | |
| Isailović, Mihailo | Mihailo Isailović | Actor, Director | 1923 | 2 | |
| Iordanidis, Giannis | Giannis Iordanidis | Actor, Director, Dramaturg, Translator | 1965 - 2008 | 16 | |
| Iversen, Trine | Trine Iversen | Actor, Lighting Designer | 1988 | 2 | |
| Iannetta, Gaetano | Gaetano Iannetta | Actor, Musical Director | 2017 | 8 | |
| Islam, Md. Shohidul | Md. Shohidul Islam (Md. Shohidul Islam) | Actor, Musician | 2000 - 2002 | 6 | |
| Isabel, Dudu | Dudu Isabel | Actor, Musician | 2016 | 2 | |
| Idowu, Temitope | Temitope Idowu | Actor, Musician | 2022 | 2 | |
| Ising Jr., Arnold | Arnold Ising Jr. (Arnold Ising Jr.) | Actor, Translator | 1889 | 2 | |
| Interne Teater, Studentersamfundets | Studentersamfundets Interne Teater (Studentersamfundets Interne Teater) | Adaptation | 1994 | 1 | |
| Ibsen Bille, Irene | Irene Ibsen Bille | Adaptation | 1955 - 1964 | 2 | 1 |
| Ibrahim, George | George Ibrahim | Adaptation, Director | 2008 | 12 | |
| Ichon, Eduard | Eduard Ichon | Adaptation, Director | 1912 - 1933 | 6 | |
| Isbell, Tom | Tom Isbell | Adaptation, Director | 2020 | 2 | |
| Idrizi, Besfort | Besfort Idrizi | Assistant Director | 2013 - 2015 | 3 | |
| Ionescu, Eugenia-Gina | Eugenia-Gina Ionescu | Assistant Director | 1985 | 2 | |
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