| William Dumond Swart | |
| Office: | Member of the New Hampshire Executive Council |
| Term Start: | 1917 |
| Term End: | 1919 |
| Office2: | President of the New Hampshire Senate |
| Term Start2: | 1911 |
| Term End2: | 1912 |
| Predecessor2: | Harry T. Lord |
| Successor2: | Enos K. Sawyer |
| Office3: | Member of the New Hampshire Senate District 19 |
| Term Start3: | 1911 |
| Term End3: | 1912 |
| Office4: | Member of the New Hampshire House of Representatives |
| Term Start4: | 1909 |
| Term End4: | 1910 |
| Office5: | President of the Nashua, New Hampshire Common Council |
| Term Start5: | 1894 |
| Term End5: | 1895 |
| Office6: | Member of the Nashua, New Hampshire Common Council |
| Term Start6: | 1893 |
| Term End6: | 1895 |
| Birth Date: | July 9, 1856 |
| Birth Place: | Margaretville, New York |
| Spouse: | Lizzie A. Roby |
| Children: | Elizabeth Swart; William Roby Swart |
William Dumond Swart (July 9, 1856 – 1936) was an American merchant, manufacturer and politician from Nashua, New Hampshire.
Swart was born on July 9, 1856 in Margaretville, New York to William R. and Eliza (Drumond) Swart.
On October 7, 1890 Swart married Lizzie A. Roby. They had two children, Elizabeth Swart and William Roby Swart.
Swart was a thirty-second degree mason.
Swart served as a member and President of the Nashua, New Hampshire Common Council, and in both houses of the New Hampshire legislature as President of the New Hampshire Senate and as a member of the New Hampshire Executive Council.[1]