| Name | Functions  | Event Dates | Events | Resources | ||
|---|---|---|---|---|---|---|
| Jerry Tessler | Director | 1972 | 1 | |||
| Paolo Todisco | Director | 1976 | 4 | |||
| Adolf Toman | Director | 1972 | 1 | |||
| Georg Terramare | Director | 1937 | 1 | |||
| El. Tanimanidi | Director | 1980 | 1 | |||
| Tom Toelle | Director | 1982 - 1986 | 2 | |||
| Ryan C. Tittle | Director | 2010 | 1 | |||
| Adam Twiss | Director | 2011 | 1 | |||
| Carlos Trafic | Director | 1990 | 1 | |||
| Camilla Tostrup | Director | 1984 | 1 | 1 | ||
| Alexa Ther | Director | 2008 | 1 | |||
| Kostis Tsonos | Director | 1975 - 1999 | 3 | |||
| Jennifer Dizon Turner | Director | 2014 | 1 | |||
| Minoru Takagi | Director | 1987 | 1 | |||
| 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 | |||