William Gustavus Whiteley (August 7, 1819 – April 23, 1886) was an American lawyer and politician from Wilmington, in New Castle County, Delaware. He was a member of the Democratic Party, who served in the Delaware General Assembly and as U.S. Representative from Delaware, Mayor of Wilmington, and Associate Judge of the Superior Court of Delaware.

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William G. Whiteley
Member of the U.S. House of Representatives from Delaware's At-large district
In office March 4, 1857 – March 3, 1861
Preceded by	Elisha D. Cullen
Succeeded by	George P. Fisher
20th Mayor of Wilmington, Delaware
In office 1875–1878
Preceded by	Joshua Simms
Succeeded by	John P. Allmond
Personal details
Born	(1819-08-07)August 7, 1819 Newark, Delaware
Died	April 23, 1886(1886-04-23) (aged 66) Wilmington, Delaware
Political party	Democratic
Residence(s)	Wilmington, Delaware
Alma mater	Princeton College
Profession	lawyer

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Whiteley was born near Newark, Delaware, to Henry and Catherine Whiteley.^{[1]: 983–4}

William attended Bullock's School at Wilmington and graduated from Princeton College in 1838. He studied law under James A. Bayard Jr., was admitted to the Delaware Bar in 1841, and began a practice in Wilmington.

He was the prothonotary of New Castle County from 1852 to 1856, and was elected as a Democrat to the 35th and 36th Congresses, serving from March 4, 1857 to March 3, 1861. While in Congress he was chairman of the Committee on Agriculture in the 35th Congress. He was not a candidate for renomination in 1860 and resumed his occupation as prothonotary of New Castle County from 1862 to 1867.

Whiteley was mayor of Wilmington from 1875 to 1878 and was a member of a commission to settle fishery disputes between New Jersey and Delaware in 1877. He was census enumerator for Delaware in 1880, and was appointed as associate judge of the Superior Court of Delaware from March 31, 1884 until his death.

Whiteley died at Wilmington and is buried in the Old Broad Street Presbyterian Church Cemetery at Bridgeton, New Jersey.

Elections are held the first Tuesday after November 1. U.S. Representatives took office March 4 and have a two-year term.

• Martin, Roger A.. (2003). Delawareans in Congress, the House of Representatives 1789-1900. ISBN 0-924117-26-5.

• Delaware Historical Society; website; 505 North Market Street, Wilmington, Delaware 19801; (302) 655-7161
• University of Delaware; Library website; 181 South College Avenue, Newark, Delaware 19717; (302) 831-2965