The Janata Party was formed in 1977 by a merger of several opposition parties, including the Bharatiya Jana Sangh, the Congress (O), and the Socialist Party.

The National Front was formed in 1989 by a merger of several opposition parties, including the Janata Dal, the Bharatiya Janata Party (BJP), and the Telugu Desam Party (TDP).

The United Front was formed in 1996 by a merger of several opposition parties, including the Janata Dal, the Communist Party of India (Marxist) (CPI(M)), and the Dravida Munnetra Kazhagam (DMK).

The United Progressive Alliance (UPA) was formed in 2004 by a merger of several opposition parties, including the Indian National Congress (INC), the Communist Party of India (Marxist) (CPI(M)), and the Dravida Munnetra Kazhagam (DMK).

The National Democratic Alliance (NDA) was formed in 2014 by a merger of several opposition parties, including the Bharatiya Janata Party (BJP), the Shiv Sena, and the Janata Dal (United).

The United Progressive Alliance (UPA) was formed in 2019 by a merger of several opposition parties, including the Indian National Congress (INC), the Communist Party of India (Marxist) (CPI(M)), and the Dravida Munnetra Kazhagam (DMK).

The Samyukta Vidhayak Dal (SVD) was formed in 1967 by a merger of several opposition parties, including the Bharatiya Jana Sangh (BJS), the Communist Party of India (CPI), and the Dravida Munnetra Kazhagam (DMK).

The Grand Alliance was formed in 1971 by a merger of several opposition parties, including the Indian National Congress (O), the Bharatiya Jana Sangh (BJS), and the Communist Party of India (CPI).

The National Democratic Alliance (NDA) was formed in 1980 by a merger of several opposition parties, including the Bharatiya Janata Party (BJP), the Janata Party, and the Lok Dal.

The National Front was formed in 1991 by a merger of several opposition parties, including the Janata Dal, the Bharatiya Janata Party (BJP), and the Telugu Desam Party (TDP).

The United Front was formed in 1998 by a merger of several opposition parties, including the Janata Dal, the Communist Party of India (Marxist) (CPI(M)), and the Dravida Munnetra Kazhagam (DMK).

The United Progressive Alliance (UPA) was formed in 2009 by a merger of several opposition parties, including the Indian National Congress (INC), the Communist Party of India (Marxist) (CPI(M)), and the Dravida Munnetra Kazhagam (DMK).

The United Progressive Alliance (UPA) was formed in 2019 by a merger of several opposition parties, including the Indian National Congress (INC), the Communist Party of India (Marxist) (CPI(M)), and the Dravida Munnetra Kazhagam (DMK).

The Socialist Party of India (SPI) was formed in 1952 by a merger of several socialist parties, including the Kisan Mazdoor Praja Party (KMPP) and the Socialist Party.

The Praja Socialist Party (PSP) was formed in 1957 by a merger of several socialist parties, including the Socialist Party of India (SPI) and the Kisan Mazdoor Praja Party (KMPP).