According to the Ministry of Home Affairs, seven persons were killed in Sunsari district in southern Nepal.
Four persons were killed in Sindhuli, four each in Jhapa and Sindhuli districts, three each in Banke, Morang and Panchthar districts and the rest others in different districts.
"At least three elderly people went missing in flood at Sundar Haraincha in Morang district," Ministry of Home Affairs spokesperson Joint Secretary Deepak Kafle was quoted as saying by the The Himalayan Times.
Hundreds of houses have been submerged in Morang. Biratnagar airport has been closed after flood water gushed into the airport area.
The government has mobilised Nepal Police, Nepali Army and Armed Police Force (APF) personnel for rescue and recovery work, the ministry said.