Irvine Luther Lenroot (January 31, 1869 – January 26, 1949) was an American attorney, jurist, and Republican Party politician from Wisconsin. He served as Speaker of the Wisconsin State Assembly from 1903 to 1907 and represented the state in the United States Congress from 1909 to 1927, first in the United States House of Representatives until 1918, and then in the United States Senate. After he lost the Republican nomination in 1926, Herbert Hoover nominated him to the United States Court of Customs and Patent Appeals.

Irvine Luther Lenroot
Born 1869 in Superior, WI
Died 1949 in Washington, DC
FJC ID: 3312
- Gender
- Male
- Race
- White
Prior employment
- Private practice, Superior, Wisconsin1898–present
- Private practice, Washington, D.C.1927–1929
- U.S. senator from Wisconsin1918–1927
- U.S. representative from Wisconsin1909–1918
- WisconsinState representative · 1901–1907
- ↳speaker · 1903–1907
- Douglas County [Wisconsin] Superior CourtReporter · 1893–1906
Appointments
- U.S. Court of Customs and Patent Appeals1929–1944 · Appointed by Herbert Hoover (Republican)Term ended: Retirement
Education
- Read law1897
- Parsons Business College, Duluth, Minnesota1889