Businesses
- G and J Burns Limited
- G Smith and Company
- Gaelic League, Colmcille Branch
- Gaelic League, Enniscorthy Branch
- Galbraith Limited, bakers
- Gallagher's tobacco shop
- Gallaher Limited, tobacco manufacturers
- Garrett Begg and Sons
- Garrison Institute
- Gaumont Company Limited
- Gavin Low Limited
- General Delivery
- General Electric Company Limited
- General Post Office
- General Synod of the Church of Ireland
- George Allen and Unwin Limited
- George Bell and Company
- George Connolly and Company
- George Downs and Company Limited, Belmont vinegar distillery
- George John Alexander and Company Limited
- George Mitchell Limited, importers of cigars and wine merchants
- George Rome and Company
- Gerald Mooney, publican
- Gerrard Brothers, printers and stationers
- Girls Own Club
- Glasthule Dairy
- Gleeson and Company
- Glenmore Cooperative Dairy Society Limited
- Globe Hotel
- Globe Parcel Express Limited, general carriers and forwarding agents
- Globe Refining Company Limited
- Godfreys, stationers
- Goodsons Limited
- Gorevan Brothers
- Gourmet and Company
- Governing Body of Enniscorthy Athenaeum
- GR Mesias
- Grainger and Smith
- Grand Canal Company
- Grand Cinema
- Grand Hotel
- Grand Hotel and Restaurant
- Grand Hotel Malahide Limited
- Grangemockler Cooperative Agricultural and Dairy Society Limited
- Granville Hotel Company
- Great Northern Hotel
- Great Northern Railway Company (Ireland)
- Great Southern and Western Railway Company
- Great Southern and Western Railway Kingsbridge Diners' Association
- Great Southern Hotel
- Greenhead Works
- Greenore Hotel
- Gresham Hotel
- Greybridge Cooperative Creamery Limited
- Griffith and Company
- Grosvenor Hotel