The Aikya Kerala Movement (meaning 'United Kerala') was a decades-long political and cultural movement in pre- and post-independence India, defined as a mass political campaign for the unification of all Malayalam-speaking regions into a single administrative unit. The movement originated in the 1920s and was driven by the principle of linguistic reorganization of states. The problem it sought to solve was the political separation of the Malayalam-speaking people, who were divided across three distinct administrative regions: the British-administered Malabar District (part of Madras Presidency) and the princely states of Travancore and Cochin.
The mechanism of the movement involved sustained political mobilization, beginning with the Indian National Congress passing a resolution for provincial units based on language at its 1920 Nagpur session, which led to the formation of the Kerala Pradesh Congress Committee (KPCC). Key milestones included the 1928 State People's Conference in Ernakulam, presided over by Jawaharlal Nehru, which passed a resolution for Aikya Kerala, and the 1947 Aikya Kerala Convention in Thrissur, chaired by K. Kelappan. The movement culminated in the creation of the modern state of Kerala on November 1, 1956, under the States Reorganisation Act, 1956. This Act merged the Malayalam-speaking regions of the existing Travancore–Cochin state with the Malabar District and the Kasaragod Taluk of South Canara district from the Madras State.
The Aikya Kerala Movement is directly connected to the broader concept of Linguistic Reorganisation of States in India and the States Reorganisation Commission (led by Fazal Ali), whose recommendations were enacted by the States Reorganisation Act, 1956. The movement's success led to the formation of the first democratically elected Communist government in the world in 1957, under E. M. S. Namboodiripad, which implemented progressive reforms that laid the foundation for the 'Kerala Model of Development'. The only significant change to the state's boundaries since its formation was the transfer of five Tamil-dominated southern taluks from Travancore-Cochin to the Madras State (now Tamil Nadu) based on the States Reorganisation Commission's recommendations.