George N. Colby (fl. c. 1880 - 1890) was an American map publisher active in Houlton, Maine in the late 19th century. Colby's corpus consists primarily of Maine focused wall maps, county and state atlases, and more specific regional maps. Colby initially worked with the U.S. Coast Survey, where his work contributed to the survey's important 1881 map of Mount Desert Island, Maine. Transitioning to the private market Colby began publishing Maine centered material in the style of Massachusetts cartography Henry Walling. That is to say, he issued highly detailed maps on a large scale that he sold by subscription to local institutions and land owners. Colby's maps, like Walling's, are exceptionally desirable for anyone interested in family history, as they often list individual family names and land holdings. Colby partnered with J. N. Stuart early in his commercial career and by the late 1890s Stuart fully took over his business.