| Bertram T. Clayton | |
| Birth Name: | Bertram Tracy Clayton |
| State: | New York |
| Term Start: | March 4, 1899 |
| Term End: | March 3, 1901 |
| Predecessor: | Israel F. Fischer |
| Succeeded: | Harry A. Hanbury |
| Birth Date: | 19 October 1862 |
| Birth Place: | Clayton, Alabama, US |
| Death Place: | Noyer, France |
| Death Cause: | Killed in action |
| Party: | Democratic |
| Spouse: | Mary Elizabeth D'Aubert Clayton |
| Alma Mater: | United States Military Academy |
| Allegiance: | United States |
| Branch: | United States Army |
| Serviceyears: | 1886–1888 1898 1901-1918 |
| Rank: | Second lieutenant Captain Colonel |
| Battles: | Spanish–American War World War I |
Bertram Tracy Clayton (October 19, 1862 – May 30, 1918) was an American soldier and politician who served as a U.S. Representative from New York from 1899 to 1901.
Born on the Clayton estate near Clayton, Alabama, he went on to attend the United States Military Academy, graduating in 1886 with John J. Pershing. He was then appointed a second lieutenant in the Eleventh Regiment, United States Infantry and served until April 30, 1888, when he resigned to go into business as a civil engineer. On May 20, 1898, he went on to serve with Troop C, New York Volunteer Cavalry (Brooklyn's Own) during the Spanish–American War in Puerto Rico, winning distinction.
After the war, Clayton served in the House of Representatives from 1899 until 1901, representing New York's fourth district. After an unsuccessful reelection bid, he was appointed as a captain in the Regular Army.
He stayed on active duty and was promoted several times up to the rank of colonel, serving in the Quartermaster Corps until World War I.
While serving in France as quartermaster of the 1st Infantry Division, Clayton was killed during a German air raid on American trenches. He was the highest-ranking West Point graduate killed in action during the war. Clayton is buried at Arlington National Cemetery with his wife, Mary Elizabeth D'Aubert Clayton.
His brother, Henry De Lamar Clayton, Jr., also served as a Member of Congress from their home state, Alabama. Their father, Henry DeLamar Clayton, Sr., was a prominent judge and major general in the Confederate army during the American Civil War and president of the University of Alabama.