"Karnataka Congress Legislature Party met in Hyderabad and unanimously elected Shri @siddaramaiah as the leader of the CLP as per the directions of Congress President Shri @RahulGandhi," Karnataka Pradesh Congress said in a tweet.
The newly elected MLAs of Congress and JDS are camping at a hotel in Hyderabad since today, fearing alleged poaching attempt by the BJP.
Siddaramaiah's election as the Congress legislative party leader comes ahead of Chief Minister BS Yeddyurappa seeking trust vote on the floor of the assembly today.
Striking a post-poll alliance, the Congress-JDS combine has claimed the support of 117 MLAs,including one of BSP and an Independent.
Polling was held in 222 of the state's 224 seats, for which results were declared on May 15.