Trinamool Congress flag Supporters of the Trinamool Congress waving the party flag at a gathering addressed by Mamata Banerjee, chief minister of West Bengal, India, in 2025. (more) Trinamool Congress political party, India Also known as: All India Trinamool Congress, Trinamul Congress(Show More) Written by Gitanjali Roy Gitanjali Roy is senior editor, Encyclopaedia Britannica. She has over two decades of editorial experience across digital and broadcast media. Gitanjali Roy Fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated Feb. 11, 2026 •History Trinamool Congress, political party in India formed by Mamata Banerjee in 1998 and active primarily in her home state of West Bengal, where it has held power since 2011. It also has a presence in northeastern states, such as Meghalaya and Tripura, and has fielded candidates in elections in Goa. The party’s official but less commonly used name is All India Trinamool Congress (“All India Grassroots Congress”), and it uses the abbreviations AITC and TMC....

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