Zachary David Massey (November 14, 1864 – July 13, 1923) was an American politician and physician who represented Tennessee's 1st congressional district in 1910 and 1911.

He studied medicine in the Louisville Medical College and commenced the practice of his profession in Wears Valley, Tennessee, in 1889.

During the Spanish–American War, Massey served as an assistant surgeon with 6th Infantry Regiment also known as the "Sixth Immunes."

[2] Massey was elected as a Republican to the Sixty-first Congress to fill the vacancy caused by the death of Walter P. Brownlow.

Massey married Sally Josephine Mullendore on November 25, 1886, and they had six children, Beulah, Roy, Blanche, Constance, Juanita, and Robert.