The United Democratic Front (UDF) is the Indian National Congress-led alliance of centre to centre-right political parties in the Indian state of Kerala. It is one of the two major political alliances in Kerala, the other being Communist Party of India (Marxist)-led Left Democratic Front, each of which has been in power alternately since 1980 E. K. Nayanar ministry. Most of the United Democratic Front constituents are members of the Indian National Congress-led United Progressive Alliance at pan-India level.

The Left Democratic Front (LDF) is an alliance of left-wing political parties in the state of Kerala, India. It is the current ruling political alliance of Kerala, since 2016. It is one of the two major political alliances in Kerala, the other being Indian National Congress-led United Democratic Front, each of which has been in power alternately for the last four decades. LDF has won the elections to the State Legislature of Kerala in the years 1980, 1987, 1996, 2006, 2016 and had a historic re-election in 2021 where an incumbent government was re-elected for first time in 40 years. LDF has won 6 out of 10 elections since the formation of the alliance in 1980. The alliance consists of CPI(M), CPI and various smaller parties.