| Birth Name: | Patrick Magruder |
| Order: | 2nd |
| Office: | Librarian of Congress |
| President: | Thomas Jefferson James Madison |
| Term Start: | December 26, 1807 |
| Term End: | January 18, 1815 |
| Predecessor: | John J. Beckley |
| Successor: | George Watterston |
| State2: | Maryland |
| Term Start2: | March 4, 1805 |
| Term End2: | March 3, 1807 |
| Predecessor2: | Thomas Plater |
| Successor2: | Philip B. Key |
| Birth Place: | Rockville, Maryland |
| Death Place: | Petersburg, Virginia |
| Spouse: | Sarah Turner, Martha Goodwyn |
| Alma Mater: | Princeton University |
| Party: | Democratic-Republican |
| Children: | Theophilus, Louisa, Edmund, Patrick, Adelina, Napolean |
| Occupation: | Lawyer, politician, librarian |
Patrick Magruder (1768 – December 24, 1819[1]) was an American lawyer, politician, and librarian who served as a Member of the U.S. House of Representatives from Maryland’s 3rd congressional District from March 4, 1805, to March 3, 1807, and as the 2nd Librarian of the United States Congress, from December 26, 1807, to January 18, 1815.
Patrick Magruder was born on his family's estate, Locust Grove, near Rockville in the Province of Maryland, in 1768, the son of Samuel Wade Magruder (1731-1792), and Lucy Beall (1738-1795). Patrick Magruder was the great-grandson of Samuel Magruder (1654-1711), the son of Alexander “the Immigrant” Magruder (1610-1676).[2] Patrick Magruder attended Princeton College and became a lawyer.[3] In 1804, he was elected to be a Member of the U.S. House of Representatives from Maryland’s 3rd congressional District, and served from March 4, 1805, to March 3, 1807. After the death of John J. Beckley, President Thomas Jefferson appointed Magruder to the dual post of Clerk of the United States House of Representatives and Librarian of Congress. The posts were not separated until 1815. Magruder served as the 2nd Librarian of the United States Congress from December 26, 1807, to January 18, 1815. During the War of 1812, the British burned Washington, D.C., including the Library of Congress, which was then housed in the US Capitol Building. After an investigation by Congress into the destruction of the library and the use of its funds, Magruder resigned. He died December 24, 1819, in Petersburg, Virginia, and was buried on his family's ancestral estate, Sweden, near Petersburg in Dinwiddie County, Virginia.[4] [5] Magruder, who first married Sarah Turner, and then Martha Goodwyn, had six children: Theophilus, Louisa, Edmund, Patrick, Adelina, and Napolean.