National Society Daughters of the Union 1861–1865
| Abbreviation | NSDU |
|---|---|
| Established | January 9, 1912 |
| Founders | Mrs. Frank Crowell |
| Founded at | New York City, New York, U.S. |
| Type | lineage society |
| Sue Bensinger Petres | |
| Website | nsdu.org |
The National Society Daughters of the Union 1861–1865 (often abbreviated as NSDU) is an American lineage society for women who descend from Union veterans of the American Civil War.