John D. Loudermilk (born March 31, 1934 in Durham, North Carolina) is an American singer and songwriter.

Loudermilk grew up in a family who were members of the Salvation Army faith and was influenced by the church singing. As a boy, he learned to play the guitar and while still in his teens, wrote a poem that he set to music. Owners of the local television station where he worked as a handyman, allowed him to play it on air resulting in country musician, George Hamilton IV putting it on record. After Eddie Cochran had his first hit record with Loudermilk's tune, "Sittin' In The Balcony", his career path in music was firmly set.

Loudermilk recorded some of his songs under his own name and the stage name, "Johnny Dee," but it was as a songwriter that he made his mark. Working out of the country music capital of America Nashville, Tennessee, John D. Loudermilk became one of the most productive songwriters of the 1960s and 70s penning country and pop music hits for the likes of the Everly Brothers, Johnny Tillotson, Chet Atkins, Paul Revere & the Raiders, Johnny Cash, Marianne Faithfull, Stonewall Jackson and others.

John D. Loudermilk was inducted into the Nashville Songwriters Hall of Fame in 1976.

Some of his most notable compositions are:

• "Tobacco Road"
• "Waterloo"
• "Ebony Eyes"
• "Abilene"
• "Indian Reservation"
• "This Little Bird"
• "Talk Back Trembling Lips"