Jammu and Kashmir Legislative Council chairman Amrit Malhotra administered the oath to the four MLCs in the Council hall.
They are Ghulam Nabi Monga (Cong), Ali Mohammad Dar (NC), both representing two seats from Kashmir, Sham Lal Bhagat (Cong) and Shenaz Ganai (NC), both from Jammu division.
Chief Minister Omar Abdullah, members of Council of ministers, legislators, top government officers and prominent citizens attended the swearing-in.
The ruling National Conference-Congress had bagged all the four Legislative council seats, elections for which were held under the Panchayat quota.