| William B. Trembley | |
| Birth Date: | 21 April 1877 |
| Birth Place: | Johnson, Kansas |
| Placeofburial: | Monticello United Methodist Church Union Cemetery, Shawnee, Johnson County, Kansas, USA |
| Placeofburial Label: | Place of burial |
| Allegiance: | United States of America |
| Branch: | United States Army |
| Serviceyears: | 1898–1899, 1917–1919 |
| Rank: | First Lieutenant |
| Unit: | Company B, 20th Kansas Volunteer Infantry |
| Battles: | Philippine–American War World War I |
| Awards: | Medal of Honor |
William Beattie Trembley (April 21, 1877 – January 13, 1952) was a private in the United States Army and a Medal of Honor recipient for his actions in the Philippine–American War. He was later commissioned as a first lieutenant in World War I.
Trembley later served as the postmaster of Kansas City, Kansas, from 1921 to 1935.
Rank and organization: Private, Company B, 20th Kansas Volunteer Infantry. Place and date: At Calumpit, Luzon, Philippine Islands, 27 April 1899. Entered service at: Kansas City, Kansas. Birth: Johnson, Kansas. Date of issue: 11 March 1902.
Citation:
Swam the Rio Grande de Pampanga in face of the enemy's fire and fastened a rope to the occupied trenches, thereby enabling the crossing of the river and the driving of the enemy from his fortified position.