Peter Myndert Dox (September 11, 1813 – April 2, 1891) was an American politician who served the state of Alabama in the U.S. House of Representatives between 1869 and 1873.

Dox was born in Geneva, Ontario County, New York on September 11, 1813.

Dox served as a member of the New York State Assembly in 1842, and as a Know Nothing judge of the Ontario County courts from November 1855 until his resignation on March 18, 1856.

He then moved to Alabama and settled in Madison County, where he engaged in agricultural pursuits.

In 1868, he was elected as a Democrat to the U.S. House of Representatives, and reelected for the following term, serving until 1873.