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United States Under Secretary of the Navy
Seal of the Department of the Navy
Flag of the Under Secretary of the Navy
Incumbent Thomas Mancinelli Acting since August 20, 2024
Department of the Navy
Style	Mr. Under Secretary The Honorable (formal address in writing)
Reports to	Secretary of the Navy
Seat	The Pentagon, Arlington County, Virginia, United States
Nominator	The President with Senate advice and consent
Term length	No fixed term
Constituting instrument	10 U.S.C. § 8015
Formation	August 22, 1940
First holder	James Forrestal
Succession	17th in SecDef succession by seniority of appointment
Deputy	Deputy Under Secretary of the Navy
Salary	Executive Schedule, Level III
Website	Official website

The Under Secretary of the Navy is the second-highest ranking civilian official in the United States Department of the Navy. The Under Secretary, called the "Under" in Pentagon slang, reports to the Secretary of the Navy (SECNAV). Before the creation of the Under Secretary's office, the second-highest civilian at the Department of the Navy was the Assistant Secretary of the Navy.

The current acting Under Secretary of the Navy is Thomas Mancinelli.

List of Under Secretaries of the Navy, 1940–present

The following men and women have held the post:

No.	Name		Assumed office	Left office	President appointed by	Secretary served under
1		James V. Forrestal	August 22, 1940	May 16, 1944	Franklin D. Roosevelt	Frank Knox
2		Ralph A. Bard	June 24, 1944	June 30, 1945		James Forrestal
3		Artemus Gates	July 3, 1945	December 31, 1945	Harry S. Truman
4		John L. Sullivan	June 17, 1946	September 18, 1947
5		W. John Kenney	September 19, 1947	September 24, 1949		John L. Sullivan
6		Dan A. Kimball	May 25, 1949	July 31, 1951		Francis P. Matthews
7		Francis P. Whitehair	August 7, 1951	January 29, 1953		Dan A. Kimball
8		Charles S. Thomas	February 9, 1953	August 5, 1953	Dwight D. Eisenhower	Robert B. Anderson
9		Thomas S. Gates Jr.	October 7, 1953	April 1, 1957		Robert B. Anderson Charles Thomas
10		William B. Franke	April 17, 1957	June 7, 1959		Thomas S. Gates Jr.
11		Fred A. Bantz	June 8, 1959	January 20, 1961		William B. Franke
12		Paul B. Fay	February 16, 1961	January 15, 1965	John F. Kennedy	John Connally Fred Korth Paul Nitze
13		Kenneth E. BeLieu	February 26, 1965	July 1, 1965	Lyndon B. Johnson	Paul Nitze
14		Robert H. B. Baldwin	July 2, 1965	July 31, 1967
15		Charles F. Baird	August 1, 1967	January 20, 1969		Paul Robert Ignatius
16		John Warner	February 11, 1969	May 4, 1972	Richard Nixon	John Chafee
17		Frank P. Sanders	May 5, 1972	June 29, 1973		John Warner
18		J. William Middendorf	August 3, 1973	June 20, 1974
19		David S. Potter	August 28, 1974	April 1, 1976	Gerald Ford	J. William Middendorf
20		David R. Macdonald	September 14, 1976	February 4, 1977
21		R. James Woolsey Jr.	March 9, 1977	December 7, 1979	Jimmy Carter	W. Graham Claytor Jr.
22		Robert J. Murray	February 7, 1980	September 29, 1981		Edward Hidalgo John Lehman
23		James F. Goodrich	September 29, 1981	August 6, 1987	Ronald Reagan	John Lehman
24		Henry L. Garrett III	August 6, 1987	May 15, 1989		Jim Webb William L. Ball
25		J. Daniel Howard	August 7, 1989	January 20, 1993	George H. W. Bush	Henry L. Garrett III Sean O'Keefe
26		Richard J. Danzig	November 29, 1993	May 30, 1997	Bill Clinton	John Howard Dalton
27		Jerry MacArthur Hultin	November 13, 1997	July 14, 2000		John Howard Dalton Richard Danzig
28		Robert B. Pirie Jr.	October 12, 2000	June 6, 2001		Richard Danzig
29		Susan M. Livingstone	July 26, 2001	February 28, 2003	George W. Bush	Gordon R. England
30		Dionel M. Aviles	October 8, 2004	May 19, 2009		Gordon R. England Donald C. Winter
31		Robert O. Work	May 19, 2009	March 22, 2013	Barack Obama	Ray Mabus
32		Janine A. Davidson	March 17, 2016	January 20, 2017
–		Thomas P. Dee (acting)	February 17, 2017	December 4, 2017	Donald Trump	Richard V. Spencer
33		Thomas B. Modly	December 4, 2017	April 7, 2020
–		Gregory J. Slavonic (acting)	April 24, 2020	January 20, 2021		James E. McPherson (acting) Kenneth J. Braithwaite
–		James F. Geurts (acting)	February 4, 2021	August 24, 2021	Joe Biden	Thomas Harker (acting)
–		Meredith A. Berger (Performing the Duties of)	August 25, 2021	April 13, 2022		Carlos Del Toro
34		Erik Raven	April 13, 2022	August 2024
–		Thomas Mancinelli (acting)	August 20, 2024	Incumbent

References

1. 5 U.S.C. § 5315
2. "Official U.S. Navy web page". Archived from the original on July 24, 2006. Retrieved 2008-10-29.{{cite web}}: CS1 maint: bot: original URL status unknown (link).
3. "Undersecretary of Navy resigns to take new job".
4. "Navy.mil Leadership Biographies". America's Navy. Retrieved 2 November 2017.
5. "United States Navy biographies". United States Department of the Navy. November 25, 2019. Retrieved 7 April 2020.
6. "United States Navy biography (Under Secretary of the Navy)". United States Department of the Navy. November 25, 2019. Retrieved 7 April 2020.
7. https://www.navy.mil/Leadership/Flag-Officer-Biographies/BioDisplay/Article/2998001/thomas-j-mancinelli/

v t e United States secretaries of the Navy
Secretaries	Cabinet-level Stoddert Smith Hamilton Jones Crowninshield S Thompson Southard Branch L. Woodbury Dickerson Paulding Badger Upshur Henshaw Gilmer Mason Bancroft Mason Preston Graham Kennedy Dobbin Toucey Welles Borie Robeson R Thompson Goff Hunt Chandler Whitney Tracy Herbert Long Moody Morton Bonaparte Metcalf Newberry Meyer Daniels Denby Wilbur Adams Swanson Edison Knox Forrestal Dept. of Defense Sullivan Matthews Kimball Anderson Thomas T. Gates Franke Connally Korth Nitze Ignatius Chafee Warner Middendorf Claytor Hidalgo Lehman Webb Ball Garrett O'Keefe Dalton Danzig England Winter Mabus Spencer Braithwaite Del Toro
Under Secretaries	Forrestal Bard A. Gates Sullivan Kenney Kimball Whitehair Thomas T. Gates Franke Bantz Fay BeLieu Baldwin Baird Warner Sanders Middendorf Potter Macdonald Woolsey Murray Goodrich Garrett Howard Danzig Hultin Pirie Livingstone Aviles Work Davidson Modly Raven
Assistant Secretaries	Pre–1954 Fox Faxon Soley McAdoo T. Roosevelt Sr. Allen Hackett Darling Newberry Satterlee Winthrop F. Roosevelt G. Woodbury T. Roosevelt Jr. Robinson Jahncke H. Roosevelt Edison Compton Bard Hensel Kenney Andrews Koehler Askins Fogler Post–1954 Financial Management and Comptroller Energy, Installations and Environment Manpower and Reserve Affairs Research, Development and Acquisitions General Counsel of the Navy defunct: Air Installations and Logistics Material Research and Development Research, Engineering and Systems Shipbuilding and Logistics

v t e Senior officials in the United States Department of Defense
Secretary of Defense Lloyd Austin Deputy Secretary of Defense Kathleen Hicks Secretaries of the Military Departments Secretary of the Army: Christine Wormuth Secretary of the Navy: Carlos Del Toro Secretary of the Air Force: Frank Kendall III Chairman of the Joint Chiefs of Staff Gen Charles Q. Brown Jr., USAF Under Secretaries of Defense for Acquisition and Sustainment: William A. LaPlante Research and Engineering: Heidi Shyu Policy: Amanda J. Dory (acting) Comptroller/Chief Financial Officer: Michael J. McCord Personnel and Readiness: Ashish Vazirani (acting) Intelligence: Milancy Harris (acting) Under Secretaries of the Military Departments Under Secretary of the Army: Gabe Camarillo Under Secretary of the Navy: Thomas Mancinelli (acting) Under Secretary of the Air Force: Melissa Dalton Vice Chairman of the Joint Chiefs of Staff ADM Christopher W. Grady, USN Chiefs of the Military Services Chief of Staff of the Army: GEN Randy A. George Commandant of the Marine Corps: Gen Eric M. Smith Chief of Naval Operations: ADM Lisa M. Franchetti Chief of Staff of the Air Force: Gen David W. Allvin Chief of Space Operations: Gen B. Chance Saltzman Chief of the National Guard Bureau Gen Steven S. Nordhaus, USAF Unified Combatant Command Commanders Africa: Gen Michael E. Langley, USMC Central: GEN Michael E. Kurilla, USA Cyber: Gen Timothy D. Haugh, USAF European: GEN Christopher G. Cavoli, USA Indo-Pacific: ADM Samuel J. Paparo Jr., USN Northern: Gen Gregory M. Guillot, USAF Southern: ADM Alvin Holsey, USN Space: Gen Stephen N. Whiting, USSF Special Operations: GEN Bryan P. Fenton, USA Strategic: Gen Anthony J. Cotton, USAF Transportation: Gen Randall Reed, USAF
- Acting

v t e  United States Navy
Category
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Structure	Navy Navy Reserve Fleet Marine Force Expeditionary Combat Command Merchant Marine Units Active ships Future ships Aircraft wings Aircraft squadrons Carrier strike group Installations Naval Observatory Master jet base Operating forces Fleet Forces Command Commander Pacific Fleet Commander Naval Forces Europe – Naval Forces Africa Naval Forces Central Command Naval Forces Southern Command Naval Special Warfare Command Naval Reserve Forces Operational Test and Evaluation Force Naval Network Warfare Command Military Sealift Command Shore Naval Sea Systems Command Naval Air Systems Command Naval Facilities Engineering Systems Command Naval Supply Systems Command Naval Information Warfare Systems Command Fleet Cyber Command Naval Academy Naval Education and Training Command Naval Meteorology and Oceanography Command Office of Naval Intelligence Naval Aviation Warfighting Development Center Naval Legal Service Command Naval Observatory Naval Safety Center Bureau of Naval Personnel Chief of Naval Personnel Bureau of Medicine and Surgery Navy Installations Command Navy Working Capital Fund Fleets Second Fleet Third Fleet Fourth Fleet Fifth Fleet Sixth Fleet Seventh Fleet Tenth Fleet Ships A–B C D–F G–H I–K L M N–O P Q–R S T–V W–Z Aircraft carriers Airships Amphibious warfare ships Auxiliaries Battleships Cruisers Destroyers Destroyer escorts Escort carriers Frigates Mine warfare vessels Monitors Patrol vessels Registered civilian vessels Sailing frigates Steam frigates Steam gunboats Ships of the line Sloops of war Submarines Torpedo boats Torpedo retrievers Unclassified miscellaneous vessels Yard and district craft
Personnel and training	People Officers Insignia Designators Enlisted Rates Ratings Classification Personnel Chaplain Corps Chief Deputy Chief Explosive ordnance disposal Medical Corps Dental Corps Nurse Corps Medical Service Corps Supply Corps Civil Engineer Corps JAG Corps JAG DJAG NCIS Boatswain's mates Hospital corpsman Naval Aviator SEALs Seabees Master-at-arms Operations specialist SWCCs Hispanic sailors Training Recruit Officer Candidate School STA-21 NROTC Naval University System (Naval War College, Naval Postgraduate School, Naval Academy, Naval Community College, Marine Corps University) BESS BFTT CNATT COMPTUEX NAWCTSD AIM Naval Chaplaincy School Naval Hospital Corps School Naval Justice School United States Armed Forces School of Music Navy Senior Enlisted Academy Navy Supply Corps School Nuclear Power School JMTC TOPGUN USNTPS Uniformed Services University of the Health Sciences
Equipment	Uniforms Awards and decorations Badges Current fleet Future fleet Reserve fleet Current aircraft Weapons Naval reactors
History and traditions	History "Anchors Aweigh" Blue Angels Continental Navy Ensign Fleet bands Fleet Week Jack Line-crossing ceremony National Museum Navy Band Ceremonial Guard Navy Flag Navy Hymn Navy Memorial Navy service numbers Navy Weeks Revolt of the Admirals Sailor's Creed Ship commissioning Ship decommissioning Ship naming conventions Tingey House USS Constitution WAVES Wetting-down United States battleship retirement debate

v t e United States Marine Corps
Leadership	Secretary of the Navy Under Secretary of the Navy Commandant of the Marine Corps Assistant Commandant of the Marine Corps Sergeant Major of the Marine Corps Military Secretary to the Commandant of the Marine Corps Marine Corps four-star generals Marine Corps three-star generals 1942–1959 2000–2009 2010–present US Congress House Armed Services Committee Seapower and Projection Forces subcommittee Senate Armed Services Committee Seapower subcommittee
Major commands	Organization of the Marine Corps Headquarters Marine Corps Marine Forces Command II Marine Expeditionary Force Marine Forces Pacific I Marine Expeditionary Force III Marine Expeditionary Force Marine Forces Reserve Fleet Marine Force Atlantic Pacific Marine Corps Combat Development Command Training & Education Command (TECOM) United States Marine Corps Warfighting Laboratory Marine Corps Systems Command
Auxiliary	Marine Corps Cyber Auxiliary
Structure	Marine air–ground task force Bases Battalions Regiments Brigades Divisions MEF/Corps Marine aviation Marine expeditionary unit Marine Security Guard Special Operations Marine Raiders Marine Raider Regiment Recon Force Division
Personnel and training	Personnel Rank insignia MOS Notable Marines Historical Marines Marine Astronauts Criminal Investigation Division Judge Advocate Division Chaplain of the Marine Corps Associated organizations Training Recruit Training School of Infantry Officer Candidates School The Basic School Martial Arts Program
Uniforms and equipment	Uniforms Awards Badges Weapons Vehicles and aircraft Individual equipment
History and traditions	History Culture Acronyms and terms Birthday Color Sergeant of the Marine Corps Eagle, Globe, and Anchor Flag Marine Band Drum and Bugle Corps Horse Marines Marine One Color Guard Silent Drill Platoon White House Sentries Service Numbers Marine Corps War Memorial Marine Detachments "Marines' Hymn" Oorah History Division National Museum Raising the Flag on Iwo Jima Rifleman's Creed Semper Fidelis march History of Hispanics in the USMC History of women in the USMC Women's Reserve Honorary Marine Toys for Tots Gung ho
Category

• Office of the Secretary of the Navy
• United States Navy civilians
• United States Under Secretaries of the Navy