Isabel Brown (6 December 1894 – 22 October 1984) was a British communist activist. Born on Tyneside, Brown obtained a scholarship to attend the Sunderland Teacher Training College. Initially highly religious, she changed her views as a result of World War I, and through attending National Council of Labour Colleges lectures led by T. A. Jackson. She became active in the National Union of Teachers and joined the Labour Party in 1918. Despite increasingly poor health, Brown continued to speak on behalf of the CPGB, teach and attend conferences until her death in 1984.