Alfred Wagstaff Jr. (March 21, 1844 – October 2, 1921) was an American lawyer and politician from New York.

"[5] His paternal grandfather was David Wagstaff, an English immigrant who made a fortune as a notable merchant.

[2] Through his maternal grandmother, he was descended from Robert Ogden, a lawyer who worked in New Jersey and New York, and served as quartermaster during the Revolutionary War.

In November 1864, he was commissioned a first lieutenant of the 91st New York Veteran Volunteers, and was detailed to the staff of Gen. William Walton Morris.

[8] In February 1865, he was promoted to major, served as chief of staff of General Samuel W. Crawford with the Army of the Potomac until the end of the war, and was brevetted as a lieutenant colonel.

from Columbia Law School in 1866, Wagstaff was admitted to the bar, practiced in New York City, and resided in West Islip.