United Democratic Front (UDF) is an alliance of political parties of Kerala state in India. This alliance is led by the Indian National Congress.

The last UDF government (2001-2006) was led by Oommen Chandy. UDF lost the state government to the Left Democratic Front in the Kerala Assembly Election held in 2006.

The constituents of UDF:[citation needed]

1. Indian National Congress (INC)
2. Indian Union Muslim League (IUML)
3. Kerala Congress (Mani) (KC(M)) of K.M. Mani
4. Kerala Congress (Balakrishna Pillai) (KC(B)) of R. Balakrishna Pillai
5. Kerala Congress (Jacob) of T.M. Jacob
6. Kerala Congress (Secular) of P.C. George
7. Janathipathya Samrakshana Samithy (JSS) of K.R. Gowri Amma
8. Communist Marxist Party (CMP) of M.V. Raghavan
9. Revolutionary Socialist Party (Baby John) (CMP) of Shibu Baby John
10. Dheevara Sabha of V. Dinakaran
11. Kerala Dalit Federation of P. Ramabhadran
12. Vishwarkarama Mahasabha

The parties in the alliance and their representation in Kerala Legislative Assembly in 2006 election as follows:

1. Indian National Congress (24)
2. Indian Union Muslim League (8)
3. Kerala Congress (Mani) (7)
4. Kerala Congress (B) (1)
5. Janathipathya Samrakshana Samithy (1)
6. Kerala Congress (Secular) (1)