Ohio - Area of significance: Architecture
| Gilcrist House |
| Gillett-Shoemaker-Welsh House |
| Gill, H., House |
| Gill, John, Farmstead |
| Gill-Luchsinger-Bahnsen House and Barn |
| Gill-Morris Farm |
| Gish Farmhouses |
| Glamorgan |
| Gleason, Edmund, House |
| Glencoe-Auburn Hotel and Clecoe-Auburn Place Row Houses |
| Glendale Cemetery |
| Glendale Historic District |
| Glendower |
| Glen Echo Historic District |
| Glenford Bank |
| Glidden, Francis K., House |
| Glynnwood Catholic Church |
| Godfrey-Johnson House |
| Godfrey, Sen. Thomas J., House |
| Golden Eagle Wine Cellars |
| Golden Lamb |
| Goldsmith, Jacob, House |
| Goldsmith, Moses, Building |
| Goll Homestead |
| Goodall Building |
| Gooding House and Tavern |
| Goodwin, Dr. Erastus, House |
| Goodyear Hall-Ohio Savings and Trust Company |
| Gordon Square Building |
| Gordon Square Historic District |
| Gorsuch, Ernest J., House |
| Goshorn, Sir Alfred T., House |
| Gothic Building, The |
| Gothic Revival House |
| Gottschall, Oscar M., House |
| Gould Block |
| Governor's Inn |
| Grace Church |
| Grace Reformed Church |
| Graefe, Henry, House |
| Grafton School |
| Graham, William, House |
| Grand Army of the Republic Memorial Hall |
| Grand Pacific Hotel |
| Grandview Cemetery |
| Grant, A. G., Homestead |
| Grant Deming's Forest Hill Allotment Historic District |
| Grant-Deneau Tower |
| Grant, William H., House |
| Granville Historic District |
| Graphic Arts Building |
| Gray-Coulton House |
| Great Hall |
| Great Lakes Historical Society Marine Museum |
| Great Southern Hotel and Theatre |
| Great Western Schoolhouse |
| Greek Revival Commercial Building |
| Greek Revival Farmhouse, Old |
| Greene Township Center |
| Greenfield Commercial Historic District |
| Green Lawn Abbey |
| Green Lawn Cemetery |
| Greenlawn Cemetery Chapel |
| Green, Lucius, House |
| Green Plain Monthly Meetinghouse |
| Green Township High School |
| Greenville Mausoleum |
| Greenville South Broadway Commercial District |
| Greenwood Cemetery |
| Greenwood Farm |
| Gregg-Crites Octagon House |
| Gregg House |
| Gregory House |
| Greyhound Bus Station |
| Grieve, Martin and Louise, House |
| Griffin, A. B.,-O. H. Griffin House |
| Griffin, Alexander B., House |
| Griffith, James, House |
| Grinnell Mill Historic District |
| Griswold Memorial Young Women's Christian Association |
| Griswold, Peck, House |
| Groesbeck, Grace, House |
| Gross, L.N., Company Building |
| Groveport Log Houses |
| Groveport School |
| Groveport Town Hall Historic Group |
| Groveport United Methodist Church |
| Gruen Watch Company-Time Hill |
| Guernsey County Courthouse |
| Gummer House |
| Gunckel's Town Plan Historic District |
| Gunn House |
| Gurney-Kochheiser House |
| Gustavus Center Historic District |
| Gwinn Estate |
| Gwynne Building |
| Hackenberg, Harvey, House |
| Haddon Hall |
| Haffey, Parley, Farm Complex |
| Haines, Frank, House |
Data from United States Park Service and Wikidata
