- Titles: Hizen no kami
- Japanese: 筒井 政憲 (Tsutsui Masanori)
Tsutsui Masanori was a Tokugawa shogunate official during the Bakumatsu period. He is perhaps best known as one of two signers of the 1854 Treaty of Shimoda, along with Kawaji Toshiakira, on behalf of the shogunate.
In the mid-1840s, he was asked on a number of occasions to provide the shogunate with his formal opinion on coastal defense and related matters. He was named Chôsen tsûshinshi heirei yôkakari (official in charge of the reception of Korean embassies to Edo) in 1846, and was promoted from yoriai to Nishinomaru Rusui the following year. In the late 1840s to early 1850s, he performed inspection tours of coastal defenses in and around Edo, oversaw economic relief efforts for the people of the city, and engaged in other activities on behalf of the shogunate. In 1852, he was formally recognized by the shogunate along with Hayashi Akira and several others for their efforts in performing surveys of historical documents.
- Ishin Shiryô Kôyô 維新史料綱要, vol 1 (1937), 6, 32, 48.
- Ishin Shiryô Kôyô, vol 1, 51, 62.
- Ishin Shiryô Kôyô, vol. 1, 144, 146, 175, 244, 248, 256, 300, 347.