William Astor Chanler (born June 11, 1867) was a Democratic politician who represented New York’s 14th Congressional District in the United States House of Representatives. Serving a single term, he held office as a Representative from December 4, 1899, to March 3, 1901. His tenure places him among the historical members of Congress from New York at the turn of the twentieth century.

Chanler’s service in Congress was as a member of the Democratic Party, representing an urban New York constituency during a period of significant political and social change in the United States. Although details of his committee assignments, legislative initiatives, or subsequent public roles are not provided in the available record, his time in office marks him as part of the broader Democratic presence in the House during this era. After leaving Congress at the conclusion of his term in 1901, he did not return to the House, and he is recorded as a former member with one term of service.