John Wentworth (Illinois politician)

John Wentworth
Illustrated portrait of Wentworth
19th & 21st Mayor of Chicago
In office
March 22, 1860  May 6, 1861
Preceded byJohn Charles Haines
Succeeded byJulian Sidney Rumsey
In office
March 10, 1857  March 2, 1858
Preceded byThomas Dyer
Succeeded byJohn Charles Haines
Member of the
U.S. House of Representatives
from Illinois
In office
March 4, 1865  March 3, 1867
Preceded byIsaac N. Arnold
Succeeded byNorman B. Judd
Constituency1st
In office
March 4, 1853  March 3, 1855
Preceded byWillis Allen
Succeeded byJames Hutchinson Woodworth
Constituency2nd
In office
March 4, 1843  March 3, 1851
Preceded byDistrict created
Succeeded byRichard S. Molony
Constituency4th
Personal details
Born(1815-03-05)March 5, 1815
Sandwich, New Hampshire, U.S.
DiedOctober 16, 1888(1888-10-16) (aged 73)
Chicago, Illinois
Political partyDemocratic (1843–1855)
Republican (1857)
SpouseRoxanna Marie Loomis
Residence(s)Chicago, Illinois

John Wentworth (March 5, 1815 – October 16, 1888), was the editor of the Chicago Democrat, publisher of an extensive Wentworth family genealogy, a two-term mayor of Chicago, and a six-term member of the United States House of Representatives (serving tenured in that body both before and after his service as mayor).

After growing up in New Hampshire, he joined the migration west and moved to the developing city of Chicago in 1836, where he made his adult life. Wentworth was affiliated with the Democratic Party until 1855; then he changed to the Republican Party. After retiring from politics, he wrote a three-volume genealogy of the Wentworth family in the United States.