| Birth Name: | John Barclay Moon |
| Birth Date: | 20 July 1849 |
| Birth Place: | Albemarle, Virginia, U.S. |
| Death Place: | Albemarle, Virginia, U.S. |
| Office1: | Member of the Virginia House of Delegates for Albemarle and Charlottesville |
| Term Start1: | December 6, 1893 |
| Term End1: | December 4, 1895 |
| Alongside1: | John S. Harris |
| Predecessor1: | William G. Farish |
| Successor1: | William H. Boaz |
| Term Start2: | December 7, 1881 |
| Term End2: | December 2, 1885 |
| Alongside2: | Thomas M. Dunn |
| Predecessor2: | Richard T. W. Duke |
| Successor2: | Walter D. Dabney |
| Party: | Democratic |
| Alma Mater: | Washington and Lee University |
John Barclay Moon (July 20, 1849 – February 20, 1915) was an American lawyer and politician who served in the Virginia House of Delegates.[1]