The Communist Party of Nepal Marxist−Leninist (Samajbadi) was a political party in Nepal. The party was founded on August 6, 2010, through a split in the Communist Party of Nepal (Marxist-Leninist). Four of the Constituent Assembly members of CPN(ML) joined the new party; Ganesh Chaudhary, Sharada Nepali, Tilak Bahadur Thapa Magar and Yadu Bansha Jha. The formation of the new party came just hours before the crucial 4th vote on election of Prime Minister. CPN-ML(Samajbadi) declared its support for Maoist chairman Pushpa Kamal Dahal in the election.
A 17-member Central Executive Committee of the new party was formed (including all four of the Constituent Assembly members). Jagat Bahadur Bogati was the chairman of the party, Yadu Bansha Jha its secretary and Tilak Bahadur Thapa Magar was the treasurer as well as chief whip of the party.
The party was registered with the Election Commission of Nepal on April 26, 2011. The party was allocated the election symbol 'hammer and spade'.
In April 2013 the party merged into the Communist Party of Nepal.