Henry Brewer Quinby (June 10, 1846 – February 8, 1924) was an American physician, businessman, and Republican politician in the U.S. state of New Hampshire.

In 1880, he graduated from the National Medical College in Washington, D.C.[1] He served in the New Hampshire House of Representatives from 1887 to 1888 and in the New Hampshire Senate from 1889 to 1890.

Quinby was chairman of the 1896 State Republican Convention.

He was elected as a Republican candidate to the office of governor in 1908.

This article about a New Hampshire politician is a stub.