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| — G — |
| Daniel G. S. | Cruz Gabaldón | Neil Gaiman | Raúl Galache | Víctor M. Gallardo |
| Eduardo Gallego | Laura Gallego | Raymond Z. Gallun | Arnould Galopin | Daniel F. Galouye |
| David Gambero | Francisco José Gamiz | Kerry Gammil | Elvio E. Gandolfo | Antoni Garcés |
| Enrique Garcés | José Luis Garci | Abraham García | Adolfina García | Guillermo Osvaldo García |
| Luis Eduardo García | P. García | Pedro M. García | Santiago García | Santiago García Albás |
| Roberto García Álvarez | Miguel Ángel García Argüez | Pedro Alberto García Bilbao | Lamberto García del Cid | Carlos García Gual |
| Luis García Jambrina | José Luis García López | Federico García Lorca | Pablo García Maeso | Gabriel García Márquez |
| Pedro Pablo García May | Vicente García Oliva | Francisco García Pavón | Omar García Ramírez | José Luis García Remiro |
| R. García Robertson | Beatriz García Sánchez | Eduardo García Sánchez | Santiago García Solans | Luisa María García Velasco |
| R. García y Robertson | Alberto García-Teresa | Jorge Gard | Carlos Gardini | Erle Stanley Gardner |
| John Gardner | Martin Gardner | Juan de Dios Garduño | Randall Garrett | Enrique Gaspar |
| Jean Gattégno | Chester S. Geier | Hugo Gernsback | David Gerrold | William Gibson |
| Alfonso José Gijón Morales | Rodolfo Gil | Carlos Giménez | Eduardo Abel Giménez | Pilar Giralt |
| Alice Glaser | Donald F. Glut | Stephen Goldin | William Goldman | Lisa Goldstein |
| Eduardo Goligorsky | Dardo Gómez | Héctor Gómez | Salvador Patricio Gómez | Luis Gómez García |
| Juan Diego Gómez Vélez | José Manuel Gómez-Pastrana López | Isa J. González | Ismael González | José Luis González |
| Mariela González | Luis González Baixauli | José Antonio González Castro | Ana González Duque | Maielis González Fernández |
| Alejandro González Gómez | Antonio González Mesa | Juan González Mesa | Fabricio González Neira | Raquel González Osende |
| Raúl Gonzálvez del Águila | William D. Goodrich | Kathleen Ann Goonan | Gennadiy Gor | Alexander Gorbovsky |
| Joe Gores | Angélica Gorodischer | Phyllis Gottieb | Ron Goulart | Luis Goytisolo |
| David Graeber | Marco Granado | Paula Grañeda | Robert Graves | Charles O. Gray |
| Graham Greene | Zane Grey | George Griffit | Daniel Grotta | Ángel Guardiola Gómez |
| María Guéra | Eva Guerrero | C. Guerrero Escalona | Eugeni Guillem | Juan Guinot |
| James Gunn |
