George Holt Henshaw was a Canadian engineer and draftsman, who worked as engineer in waterworks and for railway companies in Canada, the United States and Denmark. He is particularly known for drafting the first organizational chart designed by Daniel McCallum.

An organizational chart, also called organigram, organogram, or organizational breakdown structure (OBS), is a diagram that shows the structure of an organization and the relationships and relative ranks of its parts and positions/jobs. The term is also used for similar diagrams, for example ones showing the different elements of a field of knowledge or a group of languages.