| Galleon Theatre Company | Galleon Theatre Company | 2001 – 2005 | 3 | |
| Gastspiel Agnes Straub mit Ensemble | Gastspiel Agnes Straub mit Ensemble | 1933 – 1935 | 5 | |
| Gastspiel Agnes Symra | Gastspiel Agnes Symra | 1913 | 4 | |
| Gastspiel Alexander Moissi mit Ensemble | Gastspiel Alexander Moissi mit Ensemble | 1926 – 1933 | 5 | |
| Gastspiel Eugen Klöpfer mit Ensemble | Gastspiel Eugen Klöpfer mit Ensemble | 1928 | 4 | |
| Gastspiel Hilde Hildebrand mit Ensemble | Gastspiel Hilde Hildebrand mit Ensemble | 1937 | 3 | |
| GDF Studio | GDF Studio | 2016 | 1 | |
| Geary Theatre | Geary Theatre | | | |
| General Gablers Theatre | General Gablers Theatre | 2023 | 1 | |
| Genesian Theatre Company Inc. | Genesian Theatre Company Inc. | 1971 – 1983 | 2 | |
| George Fawcett Company | George Fawcett Company | 1902 – 1903 | 5 | |
| George H. Brennan | George H. Brennan | 1903 – 1904 | 59 | |
| Gerda Christophersen Tourneen | Gerda Christophersen Tourneen | 1937 | 1 | |
| Geukdan Toenmaru | Geukdan Toenmaru (Toenmaru Theatre Company) | 2023 – 2025 | 2 | |
| Ghesse Theatre Group | Ghesse Theatre Group | 2011 | 2 | |
| Glass Menagerie, The | The Glass Menagerie | 1984 | 1 | |
| Gobierno de Navarra | Gobierno de Navarra (Government of Navarra) | 2009 – 2010 | 12 | |
| Goseikai | Goseikai | 1913 | 1 | |
| Gothenburg City Theatre | Gothenburg City Theatre | 1951 | 2 | |
| Graduate Dramatic Society GRADS | Graduate Dramatic Society GRADS | 2000 | 1 | |
| Grav litteratur- og teatergruppe | Grav litteratur- og teatergruppe | 2013 | 1 | |
| Great Lakes Shakespeare Festival '81 | Great Lakes Shakespeare Festival '81 | 1981 | 1 | |
| Green Room Theatre | Green Room Theatre | 2024 | 1 | |
| Grêmio theatrical Casimiro de Amadores Cunha | Grêmio theatrical Casimiro de Amadores Cunha | 1964 | 1 | |
| Grenland Friteater | Grenland Friteater | 2003 – 2008 | 10 | 2 |
| Grenzlandtheater Aachen | Grenzlandtheater Aachen | 2002 – 2011 | 26 | |
| Greta & Graham Somerville | Greta & Graham Somerville | 2025 | 1 | |
| Greta March Productions LLC | Greta March Productions LLC | 2023 – 2024 | 3 | |
| Greveskogen vgs | Greveskogen vgs | 2025 | 1 | |
| Groote Schouwburg | Groote Schouwburg | 1928 | 1 | |
| Großherzogliches Hoftheater Karlsruhe | Großherzogliches Hoftheater Karlsruhe | 1917 – 1918 | 4 | |
| Großherzogliches Hoftheater zu Karlsruhe | Großherzogliches Hoftheater zu Karlsruhe | 1896 – 1917 | 51 | |
| Grup de Teatre Amics de Les Arts | Grup de Teatre Amics de Les Arts | 2023 | 2 | |
| Grupi teatror Aleksandër Moisiu | Grupi teatror Aleksandër Moisiu | 2010 | 5 | |
| Grupo Arte Atid | Grupo Arte Atid | 1998 – 2002 | 4 | |
| Grupo de Teatro de la UVa | Grupo de Teatro de la UVa | 2024 | 1 | |
| Grupo de teatro ONCE Perseverancia, La | Grupo de teatro ONCE La Perseverancia | 2025 | 1 | |
| Gruppo Teatrale l'Occasione | Gruppo Teatrale l'Occasione | 1987 | 1 | |
| Grusomhetens Teater | Grusomhetens Teater | 2009 – 2020 | 42 | 2 |
| Guinness Players, The | The Guinness Players | 1960 | 1 | |
| Gustav Lindemanns Ibsen-Theater | Gustav Lindemanns Ibsen-Theater | 1900 – 1901 | 8 | |
| Gwydion Theatre Company | Gwydion Theatre Company | 2025 | 1 | |
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