John Knight Shields (August 15, 1858 – September 30, 1934) was a Democratic United States Senator from Tennessee from 1913 to 1925.

Shields was born at his family's estate "Clinchdale", near the early pioneer settlement of Bean's Station, Tennessee in Grainger County.

He resigned that post in 1913, becoming the last Tennessean elected to the U.S. Senate by the Tennessee General Assembly prior to the 17th Amendment coming into effect.

Shields was popularly reelected in 1918 but in 1924 lost the Democratic nomination to Lawrence Tyson, and returned to the private practice of law, this time in Knoxville.

Shields died at his estate "Clinchdale" and is buried in Knoxville's Memorial Cemetery.