David Alexander Nunn (July 26, 1833 – September 11, 1918) was an American politician and a member of the United States House of Representatives from Tennessee's 8th congressional district.

They had five children, Willie T., David S., Alice Isabella, Charlie, and Cordie L. After Mary's death in 1873, he married Tennessee Whitehead in 1875.

Appointed Minister Resident to Ecuador on April 21, 1869, by President Grant, Nunn resigned on November 2, 1869.

When he was appointed by President McKinley as collector of internal revenue at Nashville, Tennessee on July 20, 1897, he served until his resignation on November 7, 1902.

Nunn died in Brownsville on September 11, 1918 (age 85 years, 47 days).