Publishers
- Gruppe C. Motorsport 4
- Gryphon Books 1
- Guardian Communications 1
- Guernsey Museums & Galleries 1
- Guild Publishing 21
- Guilford Press 2
- Guillaume 1
- Guinness Signatures 1
- Guinness Superlatives Ltd. 1
- Gulliver Books 1
- Gungarden Books 1
- Gv Art 1
- Gwas Prifysgol Cymru 1
- Gwasg Aberystwyth 2
- Gwasg Gee 1
- Gwasg Gomer 2
- Gwasg Prifysgol Cymru 3
- Gwent County Library 1
- Gwent Ornithological Society 1
- Gwerin Publications 2
- Gwydyr Mines Publications 1
- Gwynedd Archive Services 1
- Gymdeithas Yr Eisteddfod 1