- Source: Sadayoshi
- Sadayoshi Shirai
- Shirai
- Meishō
- Isoroku Yamamoto
- Provinsi Shimousa
- Empat puluh tujuh Ronin
- Pertempuran Laut Karang
- Invasi Burma oleh Jepang
- Kampanye Burma (1944–1945)
- Kampanye Burma (1944)
- Sadayoshi
- List of the verified oldest people
- Yamada Sadayoshi
- Sadayoshi Fukuda
- Taira no Sadayoshi
- Sadayoshi Kobayashi
- Sadayoshi Fujimoto
- Yunagaya Domain
- Teikō Shiotani
- Tokugawa Ieyasu
Sadayoshi (written: 定義, 定良 or 貞義) is a masculine Japanese given name. Notable people with the name include:
Sadayoshi Fukuda (福田 定良, 1917–2002), Japanese philosopher, writer and critic
Sadayoshi Fujimoto (藤本定義, 1904–1981), Japanese baseball manager
Sadayoshi Kobayashi (小林 定義, 1905–?), Japanese field hockey player
Taira no Sadayoshi (平 貞義), Japanese samurai
Sadayoshi Tanabe (田辺 定義, 1888–2000), Japanese academic
Sadayoshi Yamada (山田 定義, 1892–1971), Imperial Japanese Navy admiral