William Montague Ferry Jr. (July 8, 1824 – January 2, 1905) was a Michigan and Utah politician, an officer in the Union Army during the American Civil War, and a member of the Ferry family.

Ferry was born in the Mission House on Mackinac Island, Michigan, as the first son of the Reverend William Montague Ferry and Amanda White Ferry. In the 1830s, the family founded Ferrysburg, Michigan, and in 1834 founded and moved to Grand Haven, Michigan.

In August 1861, Ferry joined the 14th Michigan Infantry Regiment, and served during the American Civil War, eventually being made a major and lieutenant colonel in 1865.

During his service, he served alongside General Sherman, who said of Ferry, "You have left your mark in the army, and it will stand to your honor so long as the United States has an army."

William's younger brother, Noah Henry Ferry, served as a Major in the Civil War and died at the Battle of Gettysburg.

William was Supervisor in Spring Lake in 1849, again from 1854 to 1859, and finally from 1860 to 1861. in 1857 Ferry was elected to the Michigan Legislature.

In 1871, Ferry's brother Thomas W. Ferry—who was a Republican—was elected by the Michigan Legislature as a United States senator for Michigan. As a result, Thomas Ferry vacated his seat in the House of Representatives for Michigan's 4th congressional district, and William ran as the Democratic Party nominee in a special election for the seat. William Ferry lost the election to Republican Wilder D. Foster by a 58%–42% margin.

In the 1872 election, Ferry was the nominee of the Democratic Party for governor of Michigan. He received only 1.2% of the vote, losing badly to Republican John J. Bagley (61.9%), and also trailing Liberal Republican and former governor Austin Blair (36.3%). The following year, Bagley appointed Ferry as a committee member charged with revising the constitution of Michigan.