- Died: 1801, Edo
- Japanese: 森 蘭斎 (Mori Ransai)
Mori Ransai was a mid-Edo period painter of the Nagasaki school.
He traveled to Nagasaki in 1760 to study painting, and there studied Qing-style birds and flowers painting under Noshiro Shûkô, a direct student Shen Nanpin.
Mori later entered the service of the Maeda clan of Kaga domain as a court painter. He also had a collection of his designs published as Ransai gafu.
He died in Edo in 1801.
- Ono Masako, Tomita Chinatsu, Kanna Keiko, Taguchi Megumi, "Shiryô shôkai Kishi Akimasa bunko Satsuyû kikô," Shiryôhenshûshitsu kiyô 31 (2006), 223.