G
- Mario Gabelli - billionaire and founder and CEO of GAMCO Investors (Fordham University)
- Fr. Ivan Gagarin, SJ - Russian Catholic polemist and author (St-Acheul, Brugelette, and Laval)
- Delia Gallagher - American journalist (University of San Francisco)
- Sourav Ganguly - Former Indian Cricket Captain (St. Xavier's Kolkatta)
- St. Thomas Garnet SJ - canonized saint and protomartyr of St Omers, one of the Forty Martyrs of England and Wales (College of St. Omer)
- Charles de Gaulle - former President of France
- Soe Hok Gie, Indonesian activist (Kanisius in Jakarta)
- Bachir Gemayel - Lebanese politician (Université Saint-Joseph)
- Marin Getaldić - Croatian mathematician and physicist (Educated by Clavius)
- Gordon Getty - Billionaire and businessman (St. Ignatius College Preparatory)
- John Paul Getty - American-British philanthropist (St. Ignatius College Preparatory and University of San Francisco)
- Ludovico Geymonat - Italian Marxist philosopher (Istituto Sociale in Turin)
- Bhuwan Ghimire - Nepalese Research student in Astronomy (St. Xavier's College, Kathmandu)
- Carlos Ghosn - CEO of Renault and Nissan Motors (Collège Notre Dame de Jamhour in Lebanon)
- John J. Gilluly - American attorney (Jesuit High School, New Orleans)
- Bob Gibson - Hall of Fame pitcher for the St. Louis Cardinals (Creighton University)
- Saint Aloysius Gonzaga - (Gregorian University, Rome)
- Alejandro González Iñárritu - Mexican filmmaker (Universidad Iberoamericana, Mexico City)
- Baltasar Gracián - Spanish writer
- Guido Grandi - Italian priest and professor of mathematics, philosophy, and theology (Jesuit College in Cremona)
- Bernie Grant - first African-Caribbean Member of Parliament, Westminster (St. Stanislaus College, Guyana)
- Todd Graves (entrepreneur) - owner of Raising Cane's Chicken Fingers (Loyola University New Orleans)
- Stanley Greaves - well-known Guyanese and Caribbean artist (St. Stanislaus College, Guyana)
- Nick Greiner - Australian politician (St Ignatius' College, Riverview, Sydney)
- Xu Guangqi - Chinese agricultural scientist and mathematician who studied under Matteo Ricci
- Camillo-Guarino Guarini - Italian priest, mathematician, theologian and architect
- Teofisto Guingona, Jr. - Filipino politician (Xavier University – Ateneo de Cagayan)
- Teofisto "TG" Guingona III - son of Teofisto Guingona, Jr., Filipino politician (Ateneo de Manila University)
- Paul Guldin - Swiss astronomer and mathematician (Gregorian University, studied under Clavius)
- Gustavo Gutiérrez - Dominican priest, professor, author, and liberation theologian
- Jorge Guzmán - professional wrestler (Universidad Iberoamericana)
Read more about this topic: List Of Alumni Of Jesuit Educational Institutions