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- André Tacquet - Belgian mathematician whose work led to the eventual discovery of calculus (Jesuit College in Antwerp)
- John Taaffe - Founder of the "I take offence of anything said or done" (Clongowes Wood College)
- Fr. Archimandrite Robert F. Taft, S.J. - scholar on Byzantine and other Oriental Christian liturgies (Fordham University, Collegium Russicum, Pontifical Oriental Institute)
- Talleyrand - French diplomat (Jesuit College of La Flèche)
- Akbar Tanjung - Indonesian politician and former chairman of the Golkar Party (Kanisius in Jakarta)
- Torquato Tasso - Italian Renaissance poet (Jesuit College Sorrento, Italy)
- Claudio Teehankee - former Chief Justice of the Philippines (Ateneo de Manila University)
- Sister Rose Thering - American Dominican nun and activist (received PhD from St. Louis University)
- Clarence Thomas - Associate Justice of the American Supreme Court (College of the Holy Cross)
- Jay Thomas - American actor, comedian and radio talk show host (Jesuit High School in New Orleans)
- Mark Thompson - Director-General of the BBC (Stonhyurst College, UK)
- Pierre Teilhard de Chardin - French Jesuit philosopher and anthropologist (Jesuit College of Mongré in Villefranche-sur-Saône)
- Loretta Tofani - Pulitzer Prize winning journalist (Fordham University)
- Alejandro Toledo - President of Peru (University of San Francisco)
- Gerardo Torrado - Mexican footballer
- Evangelista Torricelli - Italian physicist and mathematician, best known for his invention of the barometer
- Spencer Tracy - American actor (Rockhurst High School and Marquette Academy)
- Daniel J. Travanti - American TV and movie star (Loyola Marymount University)
- Athanasius Treweek - Australian academic, linguist and code-breaker (St Ignatius' College, Riverview, Sydney)
- Pierre Elliott Trudeau - Former Prime Minister of Canada (College Jean-de-Brebeuf, Montreal)
- Donald Trump - Billionaire real estate tycoon and TV personality (Fordham University)
- Donald Tsang - Chief Executive of Hong Kong SAR (Wah Yan College, Hong Kong)
- David Tschanz - American Arabist, medical historian and author (Fairfield Prep, Saint Louis University)
- Johann Tserclaes - Count of Tilly, soldier, field marshall of the Holy Roman Imperial forces in the 30 Years' War (Cologne Jesuit Gymnasium)
- Robin Tunney - American actress (St. Ignatius College Prep, Chicago, Illinois)
Read more about this topic: List Of Alumni Of Jesuit Educational Institutions