| G | G00db0y | G00ns |
| G0ldm45k | G0rellazz G0r | G0thm0g |
| G11tch | G13 | G1UK |
| G30rg3 X | G463 | G4N0K |
| G4t3w4y | Gabe Rust | Gabor Seljan |
| Gabriel A Maggiotti | Gabriel A. Maggiotti | Gabriele Bonacini |
| Gabriele Gristina | Gabriele Zuddas | Gabriel Lima |
| Gabriel Maggiotti | Gabriel Menezes Nunes | Gabriel Quadros |
| Gael Delalleau | Gaetano Perrone | Gainover |
| Gal Goldshtein & Viktor Minin | Galoget Latorre | Gal Weizman |
| Gal Zror | Gama Sec | Gamehacker |
| GaMeS | Gammarays | Gamoscu |
| Gangstuck | Gareth Hayes | Gareth Heyes |
| Garry | Garwga | Gary Geisbert |
| Gary Nilson | Gary O'Leary-Steele | Gary Poster |
| Gat3way | GatoGamer1155 | Gaurav Baruah |
| Gb.network | Gbr | Gcsb |
| GeekHack | Geeklinuxman | GeFORC3 |
| Gega | Gem George | Gemma Hughes |
| Gentoo | Geoda | Geoff Hutchison |
| Geolado Giolado | George Christopoulos | George Clark |
| George D. Gal | Georgi Guninski | Georgi Guninsky |
| Georgios Tsimpidas | Georg Knabl | Georg Lukas |
| Georg Ph E Heise | Georich Chorbadzhiyski | Gerald Britton |
| Geraldo Alcantara | Gerard Fuguet | Gerardo Richarte |
| Gerardo Vazquez, Eduardo Arriols | Geremy Condra | Gerendi Sandor Attila |
| Gergely Eberhardt | Gerhard Hechenberger | Gerhard Wagner |
| Germaya X | Gerrie | Gerry Eisenhaur |
| Gert Fokkema | Gerwout Van Der Veen | G. Geshev |
| Ghandi | GHC | GHC Team |
| Gheetotank | Ghost Fh | Ghost Hacker |
| Giacomo Sighinolfi | Giancarlo Pinerolo | Gianluca Baldi |
| Gianluca Brindisi | Gianni Angelozzi | Gianni Gnesa |
| Gianstefano Monni | Gilbert Verdian | Gilbert Vilvoorde |
| Gil-Dong / Woo-Chi | Gilles PARC | Gilson Camelo |
| Gino Thomas | Gionathan Reale | Giorgi Dograshvili |
| Giorgio Fedon | Giovanni Delvecchio | Giovanni Pellerano |
| Girex | Girish | Giulia Melotti Garibaldi |
| Giulian Guran | Giulio Comi | Giulio Garzia |
| Giuseppe | Giuseppe D'Amore | Giuseppe D'Inverno |
| Giuseppe Fuggiano | Giuseppe 'giudinvx' D'Inverno | Giuseppe Gottardi |
| Gjoko Krstic | GlacierZ0ne | Gladiator |
| Glafkos Charalambous | Glaive | Global-Evolution |
| Gloomy | Glyn Wintle | Gmda |
| Gnanaraj Mauviel | Gneisenau | Gnix |
| Gobbles | Gobbles Security | Godminus |
| God Of Pain | Gokhan | GoLd M |
| Golem445 | Gollum | Gonzalo Villegas |
| GOODFELLAS | Google Security Research | Goran Tuzovic |
| Gosper | Gotfault Security | Goutham Madhwaraj |
| Govind Singh | Gr33nh4t | Grabarz |
| GradiusX & B33f | Grange | Grant Willcox |
| Gravitylover | GrayHatz Security Group | Grazer |
| GreenwooD | Greg Foss | Greg Hoglund |
| Greg Linares | Greg MacManus | Greg McMullin |
| Greg Miernicki | Gregor Mynarsky | Gregory Beaver |
| Gregory Draperi | Gregory Duchemin | Gregory Le Bras |
| Gregory Pickett | Gregory R. Panakkal | Gregory Smiley |
| Greg Priest | Greg.Priest | Greg Sinclair |
| GregStar | Greuff | GreyMagic Software |
| Greyvoip | Groszynskif | Groundworks Technologies |
| GroundZero Security | GroundZero Security Research | Grzdyl |
| Grzegorz Stachowiak | Grzegorz Wypych | Gsicht |
| GSS IT | GsX | Gsy |
| Gu1ll4um3r0m41n | Guang Gong | GuanYu |
| Guay-Leroux | Guga360 | GuHe |
| Guia Brahim Fouad | Guido Bakker | Guido Landi |
| Guido Vranken | Guilherme Assmann | Guilherme Marinheiro |
| Guillaume Kaddouch | Guillaume PELAT | Guillaume Ross |
| GulfTech Security | GunEggWang | Gunzip |
| Gurkirat Singh | Gus Ralph | Gustavo Sorondo |
| Gutierrez | Guy Crumpley | Guy Levin |
| Guy Pearce | Gwillcox-r7 | Gwright |
| Gx1 | Gyan Chawdhary | Gynvael Coldwind |
| Gyrniff | Gyu Tae | |
Vulmon