Publishers
- Gruppe C. Motorsport 1
- Gryphon Books 1
- Guardian Communications 1
- Guild Publishing 17
- Guilford Press 2
- Guillaume 1
- Guinness Signatures 1
- Guinness Superlatives Ltd. 1
- Gulliver Books 1
- Gv Art 1
- Gwas Prifysgol Cymru 1
- Gwasg Aberystwyth 2
- Gwasg Gomer 1
- Gwasg Prifysgol Cymru 2
- Gwent County Library 1
- Gwent Local History Council 1
- Gwerin Publications 2
- GWR 2
- Gwydyr Mines Publications 1
- Gwynedd Archive Services 1
- Gymdeithas Yr Eisteddfod 1