| Name | Functions  | Event Dates | Events | Resources | ||
|---|---|---|---|---|---|---|
| Giorgos Theodosiadis | Director | 1955 - 1984 | 3 | |||
| Richard Toma | Director | 1988 | 1 | |||
| Oliver Tobias | Director | 1991 | 3 | |||
| Stephen Tiller | Director | 1991 | 1 | 1 | ||
| Dietrich Taube | Director | 1982 - 1992 | 2 | |||
| Klaus Tews | Director | 1993 - 2003 | 4 | |||
| Anke Thiessen | Director | 1991 | 1 | |||
| Masumi Takao | Director | 1991 | 1 | |||
| Koos Terpstra | Director | 1993 | 1 | 1 | ||
| Tzara Tristana | Director | 2015 | 1 | 1 | ||
| J. Thau | Director | 1982 | 1 | |||
| Borislav Tschakrinov | Director | 1994 | 1 | |||
| Robin Telfer | Director | 1997 | 1 | |||
| Curt Timm | Director | 1997 | 1 | |||
| Ger Thijs | Director | 1995 | 1 | 1 | ||
| Jaan Tooming | Director | 1996 | 1 | |||
| Roumen Tchakarov | Director | 1995 | 1 | 1 | ||
| Murasaki Terao | Director | 1996 | 1 | |||
| Jean-Luc Tardieu | Director | 1995 | 1 | 1 | ||
| Anthony Taylor | Director | 1969 | 1 | |||
| Stig Torsslow | Director | 1955 - 1969 | 2 | 1 | ||
| Knut Thomassen | Director | 1953 - 2006 | 6 | 1 | ||
| Jim Terrell | Director | 1966 | 1 | |||
| Annelies Thomas | Director | 1965 | 1 | |||
| Francisco Turón | Director | 1995 - 2005 | 2 | |||
| Jack Tamburri | Director | 2003 - 2017 | 2 | |||
| Ivan Talijancic | Director | 2003 | 1 | 1 | ||
| Alice Teasdale | Director | 2004 | 1 | |||
| Tomasz Talerzak | Director | 2006 | 1 | |||
| Vesselin Tamahkjarov | Director | 2001 | 1 | |||
| Alex Timbers | Director | 2006 | 1 | 1 | ||
| Robert Throckmorton | Director | 2006 | 1 | |||
| Bardy Thomas | Director | 2006 | 1 | |||
| Robert Tronson | Director | 1961 | 1 | |||
| Jeffrey Tangeman | Director | 2007 | 1 | 1 | ||
| Philip Tiedemann | Director | 2008 | 1 | |||
| Hans Tannert | Director | 1938 | 1 | |||
| Steve Tague | Director | 2009 | 1 | |||
| Matthew Travisano | Director | 2009 | 1 | |||
| Leigh Tredger | Director | 2010 | 1 | |||
| Junnichi Takagi | Director | 1965 | 1 | |||
| Tommaso Tuzzoli | Director | 2010 | 1 | |||