Clyde Anderson Tolson (May 22, 1900 – April 14, 1975) was an American law enforcement officer who was the second-ranking official of the FBI from 1930 until 1972, from 1947 titled Associate Director, primarily responsible for personnel and discipline.

[6] While attending George Washington, Tolson became a member of the Delta Pi chapter of Sigma Nu.

Tolson reportedly indicated on his application that he wanted to use the job as a stepping stone to gain experience and earn enough money to open a law practice in Cedar Rapids.

[16] It has been stated that J. Edgar Hoover described: "They rode to and from work together, ate lunch together, and often traveled together on official or unofficial business.

[27] In 1965, President Lyndon B. Johnson awarded him the President's Award for Distinguished Federal Civilian Service, saying that Tolson "has been a vital force in raising the proficiency of law enforcement at all levels and in guiding the Federal Bureau of Investigation to new heights of accomplishment through periods of great National challenge.

[34] On April 10, 1975, Tolson was admitted to Doctors Community Hospital in Washington, D.C., for kidney failure.