William Mershon Lanning | |
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| Judge of the United States Court of Appeals for the Third Circuit | |
| In office May 18, 1909 – February 16, 1912 | |
| Appointed by | William Howard Taft |
| Preceded by | George M. Dallas |
| Succeeded by | John Bayard McPherson |
| Judge of the United States Circuit Courts for the Third Circuit | |
| In office May 18, 1909 – December 31, 1911 | |
| Appointed by | William Howard Taft |
| Preceded by | George M. Dallas |
| Succeeded by | Seat abolished |
| Judge of the United States District Court for the District of New Jersey | |
| In office June 1, 1904 – May 24, 1909 | |
| Appointed by | Theodore Roosevelt |
| Preceded by | Andrew Kirkpatrick |
| Succeeded by | John Rellstab |
| Member of the U.S. House of Representatives from New Jersey's 4th district | |
| In office March 4, 1903 – June 6, 1904 | |
| Preceded by | De Witt C. Flanagan |
| Succeeded by | Ira W. Wood |
| Personal details | |
| Born | William Mershon Lanning January 1, 1849 Ewing Township, New Jersey |
| Died | February 16, 1912 (aged 63) Trenton, New Jersey |
| Resting place | Presbyterian Cemetery Ewing Township, New Jersey |
| Political party | Republican |
| Education | read law |
William Mershon Lanning (January 1, 1849 – February 16, 1912) was an American lawyer, jurist, and Republican Party politician who represented New Jersey's 4th congressional district in the United States House of Representatives from 1903 to 1904. He later served as a United States district judge of the United States District Court for the District of New Jersey and as a United States Circuit Judge of the United States Court of Appeals for the Third Circuit and the United States Circuit Courts for the Third Circuit.