- U.S. actor.
- U.S. statesman, diplomat, architect, and author: 3rd president of the U.S. 1801–09.
- a river in southwestern Montana, flowing generally northeast to join the Madison and Gallatin rivers to form the Missouri River. 225 miles (362 km) long.
- a mountain in northwestern Oregon, in the Cascade Range. 10,497 feet (3,199 meters).
- a mountain in northern New Hampshire, in the Presidential Range of the White Mountains. 5,715 feet (1,742 meters).
- a male given name.
- Thomas. 1743–1826, US statesman: secretary of state (1790–93); third president (1801–09). He was the chief drafter of the Declaration of Independence (1776), the chief opponent of the centralizing policies of the Federalists under Hamilton, and effected the Louisiana Purchase (1803)
