There are 28 mathematicians whose last name begin with GIAC.
| Giacalone, Alessandro | Brown University | 1984 |
| Giaccagli, Mattia | Université Claude Bernard Lyon 1 | 2022 |
| Giaccai, Gerald | University of Illinois at Urbana-Champaign | 1970 |
| Giacchetto, Alessandro | Rheinische Friedrich-Wilhelms-Universität Bonn | 2021 |
| Giacchi, Gianluca | Université de Lausanne | 2025 |
| Giacchi, Gianluca | Università di Bologna | 2025 |
| Giachetti, Daniela | ||
| Giachoudis, Nikos | University of Thessaly | 2021 |
| Giacobbe, Andrea | University of Maryland College Park | 2001 |
| Giacobbi, Anne-Sophie | Université de Picardie Jules Verne | 2019 |
| Giacobello, Daniele | Aalborg Universitet | 2010 |
| Giacobino, Caroline | Université de Genève | 2017 |
| Giacomazzo, Mario | Arizona State University | 2018 |
| Giacomel, Lorenzo | ETH Zürich | 2023 |
| Giacomelli, Drausio | Massachusetts Institute of Technology | 1998 |
| Giacomelli, Lorenzo | Università di Roma La Sapienza | 2000 |
| Giacomin, Giambattista | Rutgers University, New Brunswick | 1995 |
| Giacomina, Francesca | Université de Genève | 2010 |
| Giacomini, Alessandro | Scuola Internazionale Superiore di Studi Avanzati (SISSA) | 2004 |
| Giacomini, Enzo | Humboldt-Universität zu Berlin | 2009 |
| Giacomini, Hector | ||
| Giacomini, Matteo | École Polytechnique | 2016 |
| Giacomini, Raffaella | University of California, San Diego | 2003 |
| Giacomo, Emilio | Università degli Studi di Perugia | 2003 |
| Giacomoni, Catherine | 2001 | |
| Giacomoni, Jacques | Université Paris IX - Dauphine | 1997 |
| Giacomotto, Cristophe | University of California, Davis | 2009 |
| Giacon, Federico | Università degli Studi di Padova | 2019 |