From 1912 to 2023, the longest serving FBI director in the United States was J. Edgar Hoover, who served for 48 years from 1924 to 1972, followed by Robert S. Mueller, III, who served as the FBI director for 12 years from 2001 to 2013.
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FBI. (March 8, 2023). Number of years served by FBI directors in the United States from 1912 to 2023 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 25, 2026, from /statistics/1371107/longest-serving-fbi-directors-us/
FBI. "Number of years served by FBI directors in the United States from 1912 to 2023." Chart. March 8, 2023. ÌÇÐÄÆƽâ°æ. Accessed July 25, 2026. /statistics/1371107/longest-serving-fbi-directors-us/
FBI. (2023). Number of years served by FBI directors in the United States from 1912 to 2023. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 25, 2026. /statistics/1371107/longest-serving-fbi-directors-us/
FBI. "Number of Years Served by Fbi Directors in The United States from 1912 to 2023." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 8 Mar 2023, /statistics/1371107/longest-serving-fbi-directors-us/
FBI, Number of years served by FBI directors in the United States from 1912 to 2023 ÌÇÐÄÆƽâ°æ, /statistics/1371107/longest-serving-fbi-directors-us/ (last visited July 25, 2026)
Number of years served by FBI directors in the United States from 1912 to 2023 [Graph], FBI, March 8, 2023. [Online]. Available: /statistics/1371107/longest-serving-fbi-directors-us/
