The list of ship decommissionings in 2020 includes a chronological list of ships decommissioned in 2020.
| Operator | Ship | Class and type | Fate | Other notes | |
|---|---|---|---|---|---|
| 24 January |  Indonesian Navy | Tanjung Nusanive | Troopship | Former passenger ferry | |
| 19 March |  Japan Maritime Self-Defense Force | Yamayuki [1] | Hatsuyuki-class destroyer | ||
| 16 November | Japan Maritime Self-Defense Force | Asayuki [2] | Hatsuyuki-class destroyer | ||
Choshichiro Edo Nikki (長七郎江戸日記) was a long-running prime-time television series in Japan. The title character was Matsudaira Choshichiro Nagayori, the son of Tokugawa Tadanaga. The premise of the show focuses on Tadanaga's death as a result of an alleged plot to overthrow his elder brother, the third shōgun Tokugawa Iemitsu. Choshichiro lives among the commoners in the shogunal capital city of Edo. Kōtarō Satomi portrayed Choshichiro throughout the series.
The Special Forces Group is the Japan Ground Self-Defense Force's special forces unit established on March 27, 2004 by the then Defense Agency to counter terrorist activities and deter guerrilla-style attacks on Japanese soil and to conduct military operations against guerrillas or enemy commandos. The unit is based in Camp Narashino in Funabashi, Chiba along with the 1st Airborne Brigade.
The 501st Tactical Reconnaissance Squadron was a squadron of the Japan Air Self-Defense Force based at Hyakuri Air Base in Ibaraki Prefecture, Japan. It was equipped with RF-4 Phantom II and Kawasaki T-4 aircraft.
The Mogami-class frigate is a Japanese multi-mission stealth frigate for the Japan Maritime Self-Defense Force (JMSDF).
Madoka Asahina is a Japanese voice actress from Shizuoka Prefecture who is affiliated with 81 Produce. She is known for her roles as Nene Sakura in New Game! and Liones Yelistratova in Hina Logi: from Luck & Logic.
Captain Miho Otani is an officer in the Japanese Maritime Self-Defense Force. She was the first woman to become the captain of a naval training vessel and a destroyer. Otani was also a member of the first female class to enter the National Defense Academy of Japan.
Rena Hasegawa is a Japanese voice actress and a former singer. Hasegawa started her career as a member of the idol girl group NGT48 in 2015, debuting as a regular member of the group's Team NIII. In 2018, she was transferred to Team G, which later merged with Team NIII to become a unified first generation in 2019. On May 18, 2019, she left the group to pursue voice acting.
JS Yaeyama (MSO-301) was the lead ship of the Yaeyama-class minesweepers of the Japanese Maritime Self-Defense Force. She was commissioned on 16 March 1993.
JS Tsushima (MSO-302) was the second ship of the Yaeyama-class minesweepers of the Japanese Maritime Self-Defense Force. She was commissioned on 23 March 1993.
JS Hachijō (MSO-303) was the third ship of the Yaeyama-class minesweepers of the Japanese Maritime Self-Defense Force. She was commissioned on 24 March 1994.
JS Kumano (FFM-2) is the second ship of the Mogami-class frigate of the Japan Maritime Self-Defense Force (JMSDF). She was named after Kumano River and shares her name with a World War II heavy cruiser Kumano and Cold War destroyer escort Kumano.
JS Asayuki (DD-132) was a Hatsuyuki-class destroyer of the Japanese Maritime Self-Defense Force.
JS Michishio (SS-591) is the second boat of the Oyashio-class submarines. She was commissioned on 10 March 1999.
JS Mogami (FFM-1) is the lead ship of the Mogami-class frigate of the Japan Maritime Self-Defense Force (JMSDF). She was named after the Mogami River and shares her name with a World War II heavy cruiser Mogami and Cold War destroyer escort Mogami.
JS Hakugei (SS-514), "White Sperm Whale", is the second boat of the Taigei-class attack submarine of Japan Maritime Self-Defense Force. The submarine was ordered from Kawasaki Heavy Industries in 2018 and laid down on 25 January 2019 at Kobe, Japan. Hakugei was launched on 14 October 2021. Delivery is expected in 2023.
JDS Azuma (ATS-4201) is a training support ship of Japan Maritime Self-Defense Force. JS Kurobe was built in 1989 for the purpose of training that cannot be handled by Azuma's equipments, and so she was removed from the register in 1999 when the new training ship Tenryu was built.
| Ship events in 2020 | |||||||||||
| Ship launches: | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | |||
| Ship commissionings: | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | |||
| Ship decommissionings: | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | |||
| Shipwrecks: | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | |||