| Ipat'eva, Anna | Anna Ipat'eva | Costume Designer | 2003 - 2005 | 2 | |
| I. Elísdóttir, Filippía | Filippía I. Elísdóttir | Costume Designer | 2001 - 2011 | 4 | |
| Indira | Indira - | Costume Designer | 2001 | 1 | |
| Islam, Sumee | Sumee Islam | Costume Designer | 2006 | 4 | |
| Ince-Kitson, Rachael | Rachael Ince-Kitson | Costume Designer | 2017 | 4 | |
| Ilić, Maja | Maja Ilić | Costume Designer | 1983 | 2 | |
| Ilardo, Scilla | Scilla Ilardo | Costume Designer | 2018 | 3 | |
| Irondelle, Séverine | Séverine Irondelle | Costume Designer | 2018 | 3 | |
| Ile, Kari Bjørg | Kari Bjørg Ile | Costume Designer | 1968 | 1 | |
| Iliopoulou, Tzina | Tzina Iliopoulou | Costume Designer | 2023 | 2 | |
| Iliopoulou, Gina | Gina Iliopoulou (Τζίνα Ηλιοπούλου) | Costume Designer | 2022 - 2023 | 4 | |
| Indraccolo, Lilian | Lilian Indraccolo | Costume Designer | 2024 | 1 | |
| Ivanova, Elena | Elena Ivanova | Costume Designer, Designer | 1991 | 2 | |
| Ivančík, Erik | Erik Ivančík | Costume Designer, Designer | 2006 - 2007 | 6 | |
| Ivars Amich, Ramón B. | Ramón B. Ivars | Costume Designer, Designer | 1996 | 2 | |
| Iglich, Bernadette | Bernadette Iglich | Dancer | 1990 | 2 | |
| Inao, Yoshifumi | Yoshifumi Inao | Dancer | 2014 - 2019 | 8 | |
| Inger, Carl | Carl Inger | Dancer | 1992 | 1 | |
| Irigoyen, Magdalena | Magdalena Irigoyen | Dancer | 1992 | 1 | |
| Iden, Beata, Kretovicova | Beata Kretovicova Iden | Dancer | 2006 - 2011 | 13 | |
| Ivi, Hadjivasiliou | Hadjivasiliou Ivi | Dancer | 2019 | 1 | |
| Isailović, Miloš | Miloš Isailović | Dancer | 2016 - 2019 | 5 | |
| Illera, Berta | Berta Illera | Dancer | 2017 - 2020 | 2 | |
| Ishiko, Kanako | Kanako Ishiko | Dancer | 2021 | 2 | |
| Isaacson, Walter Stuart | Walter Stuart Isaacson | Dancer | 2020 | 1 | |
| Ingrey, Sally | Sally Ingrey | Designer | 1984 | 1 | |
| Ions, Jason | Jason Ions | Designer | 2002 | 1 | |
| Ito, Kisaku | Kisaku Ito | Designer | 1928 - 1950 | 5 | |
| Izenberg, V. | V. Izenberg | Designer | 1940 | 1 | |
| Irish, Neil | Neil Irish | Designer | 1999 | 30 | |
| Ishak, Milad | Milad Ishak | Designer | 1978 | 1 | |
| Ingham, Sheila | Sheila Ingham | Designer | 2001 | 1 | |
| Isonuma, Yoko | Yoko Isonuma | Designer | 2008 | 1 | |
| Ishii, Yasuhiro | Yasuhiro Ishii | Designer | 1967 | 1 | |
| Izsák, Lili | Lili Izsák | Designer | 2012 | 1 | 1 |
| Iacovelli, John | John Iacovelli | Designer | 2000 - 2010 | 3 | |
| Ito, Masako | Masako Ito | Designer | 2006 - 2010 | 18 | |
| Ishihara, Kei | Kei Ishihara | Designer | 2009 | 1 | |
| Ishii, Miho | Miho Ishii | Designer | 2016 | 1 | |
| Ikeda, Tomoyuki | Tomoyuki Ikeda | Designer | 2010 | 1 | |
| Il-joon, Kim | Kim Il-joon | Designer | 2012 | 1 | |
| Ioan Popov, Diana | Diana Ioan Popov | Designer | 1972 | 1 | |
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