This is the order of battle of the Japanese and Russian fleets at the Battle of Tsushima on 2728 May 1905.
Source: "Combined Fleet Command for Battle of Tsushima" Japanese version Wikipedia[1]
Admiral Tōgō Heihachirō in Mikasa
First Division
Vice Admiral Misu Sōtarō in Nisshin
4 pre-Dreadnought battleships (all 4 × 12-inch (305 mm), 18 knots)
1 Formidable-class variant
(Capt. Ijichi Hikojirō)
(Capt. Teragaki Izō)
(variant) (Capt. Nomoto Tsunaaki)
(Capt. Matsumoto Kazu)
2 armored cruisers: both Giuseppe Garibaldi-class variants
(Capt. Katō Sadakichi)
(forward: 1 × 10-inch (254 mm), aft: 2 × 8-inch (203 mm), 20 knots)
(Capt. Takenouchi Heitarō)
(4 × 8-inch (203 mm), 20 knots)
1 dispatch vessel (2 × quick-firing 4.7-inch (120 mm), 21 knots)
(Cmdr. Yamagata Bunzō)
Third Division
Vice Admiral Dewa Shigetō in Kasagi
2 Kasagi-class (2 × 8-inch (203 mm), 22.5 knots)
(Capt. Yamaya Tanin)
(Capt. Takagi Sukekazu)
2 Niitaka-class (6 × quick-firing 6-inch (152 mm), 20 knots)
(Capt. Shōji Yoshimoto)
(Capt. Arima Ryōkitsu)
First Destroyer Division
Captain Fujimoto Shūshirō
4 Harusame-class destroyers (1 × quick-firing 12-pounder, 29 knots)
Harusame (1902) (Capt. Fujimoto)
Fubuki (1905) (Lt. Tōjima Otsukichirō)
Ariake (1904) (Lt. Cmdr. Kutsumi Tsuneo)
Arare (1904) (Lt. Watanabe Shingo)
1 ex-Russian destroyer Reshitel'nyi (1 × 3-inch (75 mm), 25.75 knots)
Akatsuki (1904) (Lt. Harada Shōsaku)
Second Destroyer Division
Captain Yajima Junkichi in Oboro
4 Ikazuchi-class destroyers (1 × quick-firing 12-pounder, 30 knots)
Oboro (1899) (Lt. Fujiwara Eisaburō)
Inazuma (1899) (Lt. Cmdr. Suga Tetsuichirō)
Ikazuchi (1898) (Lt. Cmdr. Saitō Hanroku)
Akebono (1899) (Lt. Yamanouchi Shirō)
Third Destroyer Division
Captain Yoshijima Jyūtarō in Shinonome
4 destroyers
2 Shinonome-class (1 × quick-firing 12-pounder, 30 knots)
Shinonome (Lt. Cmdr. Yoshida Mōshi)
Usugumo (Lt. Cmdr. Masuda Chūkichirō)
1 Akatsuki-class (1 × quick-firing 12-pounder, 30 knots)
Kasumi (Lt. Cmdr. Shiraishi Naosuke)
1 Ikazuchi-class (1 × quick-firing 12-pounder, 30 knots)
Sazanami (Lt. Cmdr. Aiba Tsunezō)
14th Torpedo-Boat Division
Lieut. Commander Seki Shigetaka
4 Hayabusa-class torpedo boats (3 × 18-inch (450 mm) torpedo tubes, 29 knots)
Chidori (1901) (Lt. Cmdr. Seki)
Hayabusa (1899) (Lt. Ebihara Keiichi)
Manazuru (1900) (Lt. Tamaoka Yoshirō)
Hashitaka (1903) (Lt. Miyamoto Matsutarō)
Vice Admiral Kamimura Hikonojō in armored cruiser Izumo
Second Division
Rear Admiral Shimamura Hayao in armored cruiser Iwate
2 Izumo-class (4 × 8-inch (203 mm), 20.75 knots)
Izumo (Capt. Ijichi Suetaka)
Iwate (Capt. Kawashima Reijirō)
2 Asama-class (4 × 8-inch (203 mm), 21 knots)
Asama (Capt. Yashiro Rokurō)
Tokiwa (Capt. Shigetarō Yoshimatsu
1 armored cruiser (4 × 8-inch (203 mm), 21 knots)
Azuma (Capt. Murakami Kakuichi)
1 armored cruiser (4 × 8-inch (203 mm), 20 knots)
Yakumo (Capt. Matsumoto Arinobu)
1 dispatch vessel (2 × quick-firing 4.7-inch (120 mm), 21 knots)
Chihaya (Cmdr. Eguchi Rinroku)
Fourth Division
Vice Admiral Uryū Sotokichi in Naniwa
2 Naniwa-class (2 × 10.2-inch (260 mm), 18 knots)
Naniwa (Capt. Wada Kensuke)
Takachiho (Capt. Mōri Ichihei)
1 Suma-class (2 × quick-firing 6-inch (152 mm), 20 knots)
Akashi (Capt. Ushiki Kōshirō)
1 Niitaka-class (6 × quick-firing 6-inch (152 mm), 20 knots)
Tsushima (Capt. Sentō Takenaka)
Fourth Destroyer Division
Commander Suzuki Kantarō in Asagiri
2 Harusame-class destroyers (1 × quick-firing 12-pounder, 29 knots)
Asagiri (1903) (Lt. Iida Nobutarō)
Murasame (1902) (Lt. Cmdr. Kobayashi Kenzō)
2 Shirakumo-class destroyers (1 × quick-firing 12-pounder, 31 knots)
(Lt. Cmdr. Kamata Masamichi)
(Lt. Cmdr. Nanri Dan'ichi)
Fifth Destroyer Division
Commander Hirose Juntarō in Shiranui
4 Murakumo-class destroyers (1 × quick-firing 12-pounder, 30 knots)
Shiranui (Lt. Cmdr. Kuwashima Shōzō)
Murakumo (Lt. Cmdr. Shimanouchi Kanta)
Yūgiri (Lt. Cmdr. Tashiro Miyoharu)
Kagerō (1899) (Lt. Yoshikawa Yasuhira)
9th Torpedo-Boat Division
Commander Kawase Hayaharu
4 Hayabusa-class torpedo boats (1 × 2.2-inch (57 mm), 29 knots)
Aotaka (1903) (Cmdr. Kawase)
Kari (1903) (Lt. Awaya Gazō)
Tsubame (1903) (Lt. Tajiri Yuiji)
Hato (1903) (Lt. Iguchi Daijirō)
19th Torpedo-Boat Division
Commander Matsuoka Shūzō
3 Hayabusa-class torpedo boats (1 × 2.2-inch (57 mm), 29 knots)
Kamome (1904) (Cmdr. Matsuoka)
Ootori (1904) (Lt. Ōtani Kōshirō)
Kiji (1903) (Lt. Kanzai Uemon)
Vice Admiral Kataoka Shichirō in protected cruiser Itsukushima
Fifth Division
Rear Admiral Taketomi Kunikane in Hashidate
3 Matsushima-class protected cruisers (1 × 12.6-inch (320 mm) (Canet gun), 16.5 knots)
Itsukushima (Capt. Tsuchiya Tamotsu)
Hashidate (Capt. Fukui Masayoshi)
Matsushima (Capt. Okumiya Mamoru)
1 ex-Chinese turret ship (rebuilt) Zhenyuan (4 × 12-inch (305 mm), 15.4 knots)
Chin'en (Capt. Imai Kanemasa)
1 dispatch vessel (4 × quick-firing 4.7-inch (120 mm), 20.75 knots)
Yaeyama (Cmdr. Nishiyama Sanechika)
Sixth Division
Rear Admiral Tōgō Masamichi in Suma
1 Suma-class protected cruiser (2 × quick-firing 6-inch (152 mm), 20 knots)
Suma (Capt. Tochiuchi Sōjirō)
1 protected cruiser (10 × quick-firing 4.7-inch (120 mm), 19 knots)
Chiyoda (Capt. Higashifushimi Yorihito)
2 2nd class protected cruisers
Akitsushima (Capt. Hirose Katsuhiko)
Izumi (ex-Chilean cruiser Esmeralda) (Capt. Ishida Ichirō)
Seventh Division
Rear Admiral Yamada Hikohachi in Fusō
1 ironclad cruiser
Fusō (Capt. Nagai Gunkichi)
2 unprotected cruisers
Takao (Capt. Yashiro Yoshinori)
Tsukushi (Cmdr. Tsuchiyama Tetsuzō)
2 Maya-class gunboats
Chōkai (Cmdr. Ushida Jūzaburō)
Maya (Cmdr. Fujita Sadaichi)
1 gunboat
Uji (Lt. Cmdr. Kaneko Mitsuyoshi)
15th Torpedo-Boat Division
Lieut. Commander Kondō Tsunematsu
4 Hayabusa-class torpedo boats (3 × 18-inch (450 mm) torpedo tubes, 29 knots)
Hibari (1903) (Lt. Cmdr. Kondō)
Sagi (1903) (Lt. Yokoo Nao)
Hashitaka (1903) (Lt. Mori Shunzō)
Uzura (1904) (Lt. Suzuki Ujimasa)
10th Torpedo-Boat Division
Lieut. Commander Ōtaki Michisuke
No. 43 (1900) (Lt. Cmdr. Ōtaki)
No. 40 (1901) (Sub-Lt. Nakahara Yahei)
No. 41 (1901) (Lt. Mizuno Hironori)
No. 39 (1900) (Lt. Ōgane Minoru)
11th Torpedo-Boat Division
Lieut. Commander Fujimoto Umejirō
No. 73 (1903) (Lt. Cmdr. Fujimoto)
No. 72 (1903) (Lt. Sasao Gennojō)
No. 74 (1903) (Lt. Ōtawara Tōru)
No. 75 (1903) (Lt. Kawai Taizō)
20th Torpedo-Boat Division
Lieut. Commander Kubo Kimata
No. 65 (1902) (Lt. Cmdr. Kubo)
No. 62 (1902) (Lt. Tona Genzaburō)
No. 64 (1902) (Lt. Tominaga Torajirō)
No. 63 (1902) (Lt. Eguchi Kinma)
1st Torpedo-Boat Division
Lieut. Commander Fukuda Masateru
No. 69 (1903) (Lt. Cmdr. Fukuda) Lost in battle
No. 70 (1903) (Lt. Nangō Jirō)
No. 67 (1903) (Lt. Nakamuta Takemasa)
No. 68 (1903) (Lt. Teraoka Hyōgo)
Rear Admiral Ogura Byōichirō in transport Taichū Maru
Special Duty Division
Taichū Maru (Capt. Matsumura Naoomi)
Amerika Maru (Capt. Ishibashi Hajime)
Sado Maru (Capt. Kamaya Tadamichi)
Shinano Maru (Capt. Narikawa Hakaru)
Yawata Maru (Capt. Kawai Shōgo)
Tainan Maru (Capt. Takahashi Sukeichirō)
Taijin Maru (Capt. Arakawa Noriyuki)
Heijō Maru (Capt. Chayama Toyoya)
Keijō Maru (Capt. Hanafusa Yūshirō)
Ehime Maru (Cmdr. Yonemura Sueki)
Kōryū Maru (Cmdr. Karashima Masao)
Kōsaka Maru (Cmdr. Kawamura Tatsuzō)
Mukogawa Maru (Cmdr. Tachikawa Tsuneji)
5th Uwajima Maru (Cmdr. Yonehara Sueo)
Kaijō Maru (Cmdr. Ishimaru Tōta)
Fusō Maru (Cmdr. Nakamura Kumazō)
Kantō Maru (Cmdr. Sata Naomichi)
Miike Maru (Cmdr. Kunieda Katsusaburō)
3 torpedo boat depot ships
Kumano Maru (Capt. Asai Shōjirō)
Nikkō Maru (Capt. Kimura Kōkichi)
Kasuga Maru (Capt. Obana Sangō)
Manshū Maru (Cmdr. Nishiyama Yasukichi)
Kōbe Maru (Medical Inspector Ishikawa)
Seikyō Maru (Medical Inspector Oota)
5th Torpedo-Boat Division
Lieut. Commander Ogawa Mizumichi
Fukuryū (1885) (Lt. Cmdr. Ogawa)
No. 25 (1894) (Lt. Moritsugu Kumashirō)
No. 26 (1894) (Lt. Tanaka Yoshitarō)
No. 27 (1894) (Lt. Nakayama Tomojirō)Takeshiki Guard District
16th Torpedo-Boat Division
Lieut. Commander Wakabayashi Kin
Shirataka (1899) (Lt. Cmdr. Wakabayashi)
No. 66 (1902) (Lt. Kakuta Kanzō)
17th Torpedo-Boat Division
Lieut. Commander Aoyama Yoshie
No. 34 (1900) (Lt. Cmdr. Aoyama) Lost in battle
No. 31 (1899) (Lt. Yamaguchi Sōtarō)
No. 32 (1900) (Lt. Hitomi Saburō)
No. 33 (1899) (Lt. Kawakita Kazuo)
18th Torpedo-Boat Division
Lieut. Commander Kawada Katsuji
No. 36 (1900) (Lt. Cmdr. Kawada)
No. 60 (1901) (Lt. Kishina Masao)
No. 61 (1901) (Lt. Miyamura Rekizō)
No. 35 (1900) (Lt. Soejima Murahachi) Lost in battle
First Division
Vice-Admiral Zinovy Rozhestvensky in Knyaz Suvorov
4 Borodino-class battleships (4 × 12-inch (305 mm), 18 knots)
Knyaz Suvorov (Capt. 1st rank Vasily Ignatius)
Imperator Aleksandr III (Capt. 1st rank Nikolai Bukhvostov)
Borodino (Capt. 1st rank Pyotr Serebrennikov)
Oryol (Capt. 1st rank Nikolay Yung)
1 Izumrud-class protected cruiser (6 × 4.7-inch (120 mm) guns, 24 knots)
Zhemchug (Capt. 2nd rank Pavel Levitsky)
Second Division
Captain 1st rank Vladimir Baer in Oslyabya
Oslyabya (Peresvet-class) (Capt. 1st rank Vladimir Baer)
Sissoi Veliky (battleship) (Capt. 1st rank Manuil Ozerov)
Navarin (variant of Trafalgar-class) (Capt. 1st rank Baron Bruno von Vietinghoff)
1 Imperieuse-class armored cruiser (variant)
Admiral Nakhimov (Capt. 1st rank Aleksandr Rodionov)
1 Izumrud-class protected cruiser
Izumrud (Capt. 2nd rank Hans William von Fersen)
Third Division
Rear-Admiral Nikolai Nebogatov in Imperator Nikolai I
1 Imperator Aleksandr II-class battleship
Imperator Nikolai I (Capt. 1st rank Vladimir Smirnov)
3 Admiral Ushakov-class coastal defense ships
General Admiral Graf Apraksin (Capt. 1st rank Nikolai Lishin)
Admiral Seniavin (Capt. 1st rank)
Admiral Ushakov (Capt. 1st rank Vladimir Miklukha)
First Cruiser Division
Rear-Admiral Oskar Enkvist) in Oleg
Oleg (Bogatyr-class) (Capt. 1st rank Leonid Dobrotvorsky)
Aurora (Pallada-class) (Capt. 1st rank Evgeny Egoriev, Capt. 2nd rank Arkady Nebolsin)
Dmitrii Donskoi (Capt. 1st rank Ivan Lebedev)[2]
Vladimir Monomakh (Capt. 1st rank Vladimir Popov)
Second Scouting Division
1 protected cruiser
Svetlana (Capt. 1st rank Sergei Shein)
Ural (Capt. 2nd rank Mikhail Istomin)
First Destroyer Division
Byedovy (Capt. 2nd rank Nikolai Baranov)
Bystryy (1902) (Lt. Otto Theodor von Richter)
Buiny (Capt. 2nd rank Nikolai Kolomeytsev)
Bravyy (Lt. Pavel Durnovo)
Second Destroyer Division
Blestyashchiy (Capt. 2nd Rank Aleksandr Shamov)
Gromky (Capt. 2nd rank Georgy Kern)
Grozny (Capt. 2nd rank Konstantin Andrzhievsky)
Bezuprechny (Capt. 2nd rank Iosif Matusevich II)
Bodryy (Capt. 2nd rank Pyotr Ivanov)
Auxiliaries
1 armed yacht classified as 2nd class cruiser
Almaz (Capt. 2nd rank Ivan Chagin)
2 transport/merchant ships
Anadyr (Capt. 2nd rank Vladimir Ponomarev)
Irtuish (Capt. 2nd rank Konstantin Egormyshev)
Kamchatka (Capt. 2nd rank Andrey Stephanov)
Koreya (Capt. 1st rank Bakanov)
2 fleet tugs
Rus (Capt. 1st rank V. V. Pernits)
Svir (Enisgn Gustav Rosenfeld)
Oryol (Capt. 2nd rank Yakov Lakhmatov)
Kostroma (Colonel Nikolai Smelsky)