Isaac W. Van Schaick
Photo by C. M. Bell, ca. 1890
Member of the U.S. House of Representatives from Wisconsin's 4th district
In office March 4, 1889 – March 3, 1891
Preceded by	Henry Smith
Succeeded by	John L. Mitchell
In office March 4, 1885 – March 3, 1887
Preceded by	Peter V. Deuster
Succeeded by	Henry Smith
Member of the Wisconsin Senate from the 5th district
In office January 1, 1877 – January 1, 1883
Preceded by	Robert Hall Baker
Succeeded by	Jedd Philo Clark Cottrill
Member of the Wisconsin State Assembly from the Milwaukee 1st district
In office January 4, 1875 – January 3, 1876
Preceded by	Alfred L. Cary
Succeeded by	Patrick Drew
In office January 6, 1873 – January 5, 1874
Preceded by	John W. Cary
Succeeded by	Alfred L. Cary
Personal details
Born	December 7, 1817 Coxsackie, New York, U.S.
Died	August 22, 1901(1901-08-22) (aged 83) Catonsville, Maryland, U.S.
Resting place	Athens Rural Cemetery Athens, New York
Political party	Republican
Spouse	Eliza Sanderson ​ ​ (m. 1842⁠–⁠1901)​
Relatives	Aaron Van Schaick Cochrane (nephew)
Occupation	Manufacturer

Isaac Whitbeck Van Schaick (December 7, 1817 – August 22, 1901) was an American businessman and Republican politician. He served two terms in the U.S. House of Representatives, representing Milwaukee County, Wisconsin. He also served six years in the Wisconsin State Senate and two years in the State Assembly. His nephew, Aaron Van Schaick Cochrane, was also a member of congress.

Van Schaick was born in Coxsackie, New York, on December 7, 1817. He was educated in the common schools there and worked on his father's farm. He engaged in the manufacture of glue in New York. He moved to Chicago in 1857, and to Milwaukee, Wisconsin, in 1861, where he was in the flour-milling business with his wife's family. After the American Civil War, Van Schaick traveled to Arkansas and worked for in the cotton industry. He returned to Milwaukee three years later.^[1]

Van Schaick was elected to the Milwaukee Common Council in 1871. He served as member of the Wisconsin State Assembly in 1873 and 1875. He served in the Wisconsin State Senate from 1877 to 1882.

Van Schaick was elected as a Republican to the Forty-ninth Congress in 1884 as the representative of Wisconsin's 4th congressional district. He declined to be a candidate for renomination in 1886, and was succeeded by Henry Smith of the Union Labor Party.

Van Schaick defeated Smith for election to the 51st United States Congress in 1888, receiving 22,212 votes to 20,685 for Smith (running on the Democratic and Labor tickets), 527 for Socialist John Schuler and 302 for Prohibitionist George Heckendorn.^[2] He was not a candidate for renomination to Congress in 1890, and was succeeded by Democrat John Lendrum Mitchell. In 1892 he ran unsuccessfully for State Senator from the 4th district, losing to Democrat James W. Murphy.^[3]

He moved to Catonsville, Maryland, in 1894, where he lived in retirement until his death there August 22, 1901. He was interred in Athens Cemetery, Athens, New York.

Isaac Van Schaick married Eliza Sanderson, daughter of John Sanderson and Margaret Whitfield, in 1842, in Athens, New York. She survived him, but died two years later, in 1903.

• United States Congress. "Isaac W. Van Schaick (id: V000058)". Biographical Directory of the United States Congress.
• Isaac W. Van Schaick at Find a Grave