Overview of the Order of Battle for Leyte Gulf
The Battle of Leyte Gulf, generally considered to be the largest naval combat in history, was fought 24–25 October 1944 in the waters of the Philippine Islands by elements of the Imperial Japanese Navy's Combined Fleet (bringing together the IJN's 2nd Fleet, 3rd Fleet and 5th Fleet) and the United States Navy's Pacific Fleet (bringing together the USN's 3rd Fleet and 7th Fleet). Of the five separate engagements that made up the battle as a whole, the forces involved in the three principal ones are listed here. 
Since the Japanese assumed the tactical initiative in all three actions, their forces are listed first in each section.
"Losses in these three actions"
IJN: 1 fleet carrier, 3 light carriers, 2 old battleships, 3 heavy cruisers, 3 light cruisers, 9 destroyers, 1 oiler
USN: 2 escort carriers, 2 destroyers, 1 destroyer escort 
24–25 Oct – Battle of Surigao Strait.
Japanese Forces.
Southern Force
Vice Admiral Shōji Nishimura (killed during battle) in battleship "Yamashiro"
 Force C (sortied from Brunei Bay 22 Oct)
 Vice Adm. Nishimura (KIA)
 Battleship Division 2 (Vice Adm. Nishimura – KIA)
 2 Fusō-class old battleships (12 × 14-in. main battery)
 Fusō (sunk by torpedoes 25 Oct), Yamashiro (sunk by gunfire 25 Oct)
 1 Mogami-class heavy cruiser (6 × 8-in. main battery)
 Mogami (damaged by gunfire and air attacks, scuttled 25 Oct)
 Destroyer Division 4 (Capt. Kameshirou Takahashi)
 3 Asashio-class destroyers (6 × 5-in. main battery)
 Michishio (sunk by torpedo and gunfire 25 Oct), Yamagumo (sunk by torpedo 25 Oct), Asagumo (sunk by torpedo and gunfire 25 Oct)
 1 Shiratsuyu-class destroyer (5 × 5-in. main battery)
 Shigure
 Second Striking Force (sortied from Pescadores, Formosa 22 Oct)
 Vice Admiral Kiyohide Shima in heavy cruiser "Nachi"
 Cruiser Division 21 (Vice Admiral Shima)
 2 Myōkō-class heavy cruisers (10 × 8-in. main battery)
 Nachi, Ashigara
 Destroyer Squadron 1 (Rear Adm. Masatomi Kimura)
 1 Nagara-class light cruiser (7 × 5.5-in. main battery)
 Abukuma (sunk by air attack 26 Oct)
 4 destroyers
 2 Fubuki-class (6 × 5-in. main battery)
 Akebono, "Ushio" 
 1 Asashio-class (6 × 5-in. main battery)
 Kasumi
 1 Kagero-class (6 × 5-in. main battery)
 Shiranui (sunk by air attack 27 Oct)
American Forces.
Seventh Fleet
Vice Admiral Thomas C. Kinkaid in amphibious command ship "Wasatch"
 Task Force 77 (Central Philippines Attack Force)
 Vice Admiral Kinkaid
 Task Group 77.2 
 Rear Admiral Jesse B. Oldendorf in heavy cruiser "Louisville"
 Task Unit 77.2.2 (Left Flank)
 Rear Admiral Jesse B. Oldendorf
 3 heavy cruisers
 1 Northampton-class (9 × 8-in. main battery)
 Louisville (Capt. S.H. Hurt)
 1 Portland-class (9 × 8-in. main battery)
 Portland (Capt. Thomas G. W. Settle)
 1 New Orleans-class (9 × 8-in. main battery)
 Minneapolis (Capt. H.B. Slocum)
 2 light cruisers
 Both Cleveland-class (12 × 6-in. main battery)
 Denver (Capt. Albert M. Bledsoe)
 Columbia (Capt. Maurice E. Curts)
 Destroyer Squadron 56 (Capt. Roland N. Smoot)
 9 Fletcher-class destroyers (5 × 5-in. main battery)
 Newcomb, Richard P. Leary, Albert W. Grant (damaged by friendly and enemy gunfire), Robinson, Halford, Bryant, Heywood L. Edwards, Bennion, Leutze
 Task Unit 77.2.1 (Battle Line)
 Rear Admiral George L. Weyler in battleship "Mississippi"
 6 old battleships
 2 Colorado-class (8 × 16-in. main battery)
 West Virginia (Capt. Herbert V. Wiley)
 Maryland (Capt. Herbert J. Ray)
 2 Tennessee-class (12 × 14-in. main battery)
 Tennessee (Capt. J.B. Heffernan)
 California (Capt. H.P. Burnett)
 1 New Mexico-class (12 × 14-in. main battery)
 Mississippi (Capt. H.J. Redfield)
 1 Pennsylvania-class (12 × 14-in. main battery)
 Pennsylvania (Capt. C.F. Martin)
 6 destroyers
 4 Fletcher-class (5 × 5-in. main battery)
 Sigourney, Claxton, Aulick, Cony 
 2 Gleaves-class (4 × 5-in. main battery)
 Thorn, Welles
 Task Group 77.3 (Right Flank)
 Rear Admiral Russell S. Berkey in light cruiser "Phoenix"
 1 heavy cruiser
 1 County-class (8 × 8-in. main battery)
 Shropshire (Capt. C.A.G. Nichols, RN)
 2 light cruisers
 Both Brooklyn-class (15 × 6-in. main battery)
 Phoenix (Capt. J.H. Duncan)
 Boise (Capt. J.S. Roberts)
 Destroyer Squadron 24 (Capt. Kenmore M. McManes)
 5 Fletcher-class (5 × 5-in. main battery)
 Hutchins, Bache, Beale, Daly, Killen
 1 Tribal-class (8 × 4.7-in. main battery)
 Arunta
 Picket Patrol
 Destroyer Squadron 54 (Capt. Jesse G. Coward)
 Destroyer Division 107
 2 Fletcher-class (5 × 5-in. main battery)
 Remey, Monssen
 Destroyer Division 108
 3 Fletcher-class (5 × 5-in. main battery)
 McDermut, McGowan, Melvin 
 Task Group 70.1 Motor Torpedo Boats
 18 motor torpedo boats (MTB)
 MTB Squadron 7: MTBs 127, 128, 129, 130, 131, 132, 134, 137
 MTB Squadron 12: MTBs 146, 150, 151, 152, 190, 191, 192, 194, 195, 196
25 Oct – Battle off Samar.
Japanese Forces.
Centre Force ('Force A') (sortied from Brunei Bay 22 Oct)
 1st Section
 Vice Admiral Takeo Kurita
 Battleship Division 1 (Vice Adm. Matome Ugaki)
 2 battleships
 Yamato (9 × 18-in. main battery)
 Nagato (8 × 16-in. main battery)
 Cruiser Division 4 (Vice Adm. Kurita)
 1 heavy cruiser
 Chōkai (10 × 8-in. main battery) (scuttled 25 Oct)
 Cruiser Division 5 (Vice Adm. Shintaro Hashimoto)
 1 heavy cruiser
 Haguro (10 × 8-in. main battery)
 Destroyer Squadron 2 (Rear Adm. Mikio Hayakawa)
 1 light cruiser
 Noshiro (6 × 6.1-in. main battery) (sunk by air attack 26 Oct)
 9 destroyers
 8 Yugumo-class (6 × 5-in. main battery)
 Akishimo, Asashimo, Fujinami (sunk by air attack 27 Oct), Hamanami, Hayashimo (sunk by air attack 26 Oct), Kishinami, Okinami, Naganami
 1 Shimakaze (experimental destroyer type with 15 torpedo tubes)
Shimakaze (6 × 5-in. main battery)
 2nd Section
 Vice Admiral Yoshio Suzuki
 Battleship Division 3 (Vice Adm. Suzuki)
 2 battleships
 Kongō (8 × 14-in. main battery)
 Haruna (8 × 14-in. main battery)
 Cruiser Division 7 (Vice Adm. Kazutaka Shiraishi)
 4 heavy cruisers
 Kumano (10 × 8-in. main battery)
 Suzuya (10 × 8-in. main battery) (sunk by air attack 25 Oct)
 Chikuma (8 × 8-in. main battery) (sunk/scuttled 25 Oct)
 Tone (8 × 8-in. main battery)
 Destroyer Squadron 10 (Rear Adm. Susumu Kimura)
 1 light cruiser
 Yahagi (6 × 6.1-in. main battery)
 6 destroyers
 5 Kagero-class (6 × 5-in. main battery)
 Hamakaze, Isokaze, Nowaki (sunk by air attack 26 Oct), Urakaze, Yukikaze
 1 Yugumo-class (6 × 5-in. main battery)
 Kiyoshimo
 Note: Battleship "Musashi" and heavy cruisers "Atago" (Kurita's original flagship), "Takao", "Myōkō", and "Maya" had been assigned to Center Force, but had been sunk or damaged by air and submarine attacks prior to the Battle off Samar.
American Forces.
Seventh Fleet
Vice Admiral Thomas C. Kinkaid in amphibious command ship "Wasatch"
 Task Force 77 (Central Philippines Attack Force)
 Vice Admiral Kinkaid
 Task Group 77.4 (Escort Carrier Group)
 Rear Admiral Thomas L. Sprague
 Task Unit 77.4.3 ("Taffy 3")
 Rear Admiral Clifton A.F. Sprague
 6 escort carriers
 Fanshaw Bay (Capt. D.P. Johnson)
 Composite Squadron 68 (Lt. Cmdr. R.S. Rogers)
 16 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers
 St. Lo (Capt. F.J. McKenna) (sunk by kamikaze 1125 hrs.)
 Composite Squadron 65 (Lt. Cmdr. R.M. Jones)
 17 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers
 White Plains (Capt. D.J. Sullivan)
 Composite Squadron 4 (Lt. E.R. Fickenscher)
 16 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers
 Kalinin Bay (Capt. T.B. Williamson)
 Composite Squadron 3 (Lt. W.H. Keighley)
 16 FM-2 Wildcat fighters
   1 TBF, 11 TBM Avenger torpedo bombers
 Carrier Division 26 (Rear Adm. Ralph A. Ofstie)
 Kitkun Bay (Capt. J.P. Whitney)
 Composite Squadron 5 (Cmdr. R.L. Fowler)
 14 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers 
 Gambier Bay (Capt. W.V.R. Vieweg) (sunk by gunfire 0907 hrs.)
 Composite Squadron 10 (Lt. Cmdr. E.J. Huxtable)
 18 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers
 Screen
 3 Fletcher-class destroyers (5 × 5-in. main battery)
 Hoel (sunk by gunfire 0855 hrs.), Heermann, Johnston (sunk by gunfire 1010 hrs.)
 4 John C. Butler-class destroyer escorts (2 × 5-in. main battery)
 Dennis, John C. Butler, Raymond, Samuel B. Roberts (sunk by gunfire 1005 hrs.)
 Task Unit 77.4.2 ("Taffy 2")
 Rear Admiral Felix B. Stump
 6 escort carriers
 Natoma Bay (Capt. A.K. Morehouse)
 Composite Squadron 81 (Lt. Cmdr. R.C. Barnes)
 16 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers
 Manila Bay (Capt. Fitzhugh Lee, III)
 Composite Squadron 80 (Lt. Cmdr. H.K. Stubbs)
 16 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers 
 Carrier Division 27 (Rear Adm. William D. Sample)
 Marcus Island (Capt. C.F. Greber)
 Composite Squadron 21 (Lt. Cmdr T.O. Murray)
 12 FM-2 Wildcat fighters
 11 TBM Avenger torpedo bombers 
 Kadashan Bay (Capt. R.N. Hunter) 
 Composite Squadron 20 (Lt. Cmdr. J.R. Dale)
 15 FM-2 Wildcat fighters
 11 TBM Avenger torpedo bombers 
 Savo Island (Capt. C.E. Ekstrom)
 Composite Squadron 27 (Lt. Cmdr. P.W. Jackson)
 16 FM-2 Wildcat fighters
 12 TBM Avenger torpedo bombers 
 Ommaney Bay (Capt. H.L. Young)
 Composite Squadron 75 (Lt. Cmdr. A.W. Smith)
 16 FM-2 Wildcat fighters
 11 TBM Avenger torpedo bombers 
 Screen
 3 Fletcher-class destroyers (5 × 5-in. main battery)
 Haggard, Franks, Hailey
 5 John C. Butler-class destroyer escorts (2 × 5-in. main battery)
 Richard W. Suesens, Abercrombie, Oberrender, LeRay Wilson, Walter C. Wann
25 - 26 Oct – Battle off Cape Engaño.
Japanese Forces.
Northern Force ('Main Body') (sortied from Japanese Home Islands 20 Oct)
Vice Admiral Jisaburo Ozawa
 Carrier Division 3 (Vice Adm. Jisaburo Ozawa)
 1 fleet carrier
 Zuikaku (sunk by air attack 25 Oct)
 3 light carriers
 Zuihō (sunk by air attack 26 Oct)
 Chitose (sunk by air attack, gunfire and torpedoes 26 Oct)
 Chiyoda (sunk by air attack, gunfire and torpedoes 26 Oct)
 Combined air group
 39 Mitsubishi A6M2 'Zeke' fighters
 42 Yokosuka D4Y1 'Judy' dive bombers
 33 Nakajima B6N 'Jill' torpedo bombers
   4 Nakajima B5N2 'Kate' torpedo bombers 
 Carrier Division 4 (Rear Adm. Chiaki Matsuda)
 2 hybrid battleship carriers
 Ise (8 × 14-in. main battery)
 Hyūga (8 × 14-in. main battery)
 Combined air group for this operation: none
 Screen
 1 light cruiser
 Isuzu (7 × 5.5-in. main battery)
 8 destroyers
 4 Akizuki-class (6 × 3.9-in. main battery)
 Akizuki (sunk by air attack 25 Oct), Hatsuzuki (sunk by gunfire 25 Oct), Shimotsuki, Wakatsuki
 4 Matsu-class (3 × 5-in. main battery)
 Kiri, Kuwa, Maki, Sugi
 2 light cruisers
 Tama (7 × 5.5-in. main battery) (sunk by submarine 25 Oct)
 Ōyodo (6 × 6.1-in. main battery)
 Supply Unit
 2 oilers: Jinei Maru (sunk), Takane Maru
 1 destroyer: Akikaze (4 × 4.7-in. main battery)
 6 escort vessels: "CD-22", "CD-29", "CD-31", "CD-33", "CD-43", "CD-132"
American Forces.
Third Fleet 
Admiral William F. Halsey in battleship 'New Jersey'
 Task Force 38 (Fast Carrier Force)
 Vice Admiral Marc A. Mitscher in fleet carrier 'Lexington'
 Task Group 38.2 (Task Group Two)
 Rear Adm. Gerald F. Bogan
 1 fleet carrier
 Intrepid
 2 light carriers
 Cabot
 Independence
 2 fast battleships
 Both "Iowa"-class (9 × 16-in./50-cal. main battery)
 Iowa
 New Jersey
 3 light cruisers
 Biloxi
 Vincennes
 Miami
 16 destroyers
 Task Group 38.3 (Task Group Three)
 Rear Adm. Frederick C. Sherman
 2 fleet carriers
 Essex
 Lexington
 1 light carrier
 Langley
 2 fast battleships
 Both "South Dakota"-class (9 × 16-in./45-cal. main battery)
 South Dakota
 Massachusetts
 3 light cruisers
 Santa Fe
 Mobile
 Reno
 10 destroyers
 Task Group 38.4 (Task Group Four)
 Rear Adm. Ralph E. Davison
 2 fleet carriers
 Franklin
 Enterprise
 2 light carriers
 San Jacinto
 Belleau Wood
 2 fast battleships
 1 "North Carolina"-class (9 × 16-in./45-cal. main battery)
 Washington
 1 "South Dakota"-class (9 × 16-in./45-cal. main battery)
 Alabama
 2 heavy cruisers
 New Orleans
 Wichita
 15 destroyers
 Task Force 34 (formed at 02:40 on 25 October, dissolved at 10:55 on 25 October)
 Vice Adm. Willis A. Lee
 6 fast battleships
 2 heavy cruisers
 New Orleans
 Wichita
 5 light cruisers
 Santa Fe
 Mobile
 Biloxi
 Vincennes
 Miami
 18 destroyers
References.
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