David Hartley Armstrong | |
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| United States Senator from Missouri | |
| In office September 29, 1877 – January 26, 1879 | |
| Appointed by | John S. Phelps |
| Preceded by | Lewis V. Bogy |
| Succeeded by | James Shields |
| Personal details | |
| Born | October 21, 1812 Nova Scotia, British Canada |
| Died | March 18, 1893 (aged 80) St. Louis, Missouri, US |
| Political party | Democratic |
| Signature | .png){kind=small} |
David Hartley Armstrong (October 21, 1812 – March 18, 1893) was a United States senator from Missouri.