John Ramsay Allardyce Nicoll (28 June 1894 – 17 April 1976) was a Scottish literary scholar and teacher.
Allardyce Nicoll was born in Partick, Glasgow, and educated at Stirling High School and the University of Glasgow, where he was the G. A. Clark scholar in English.[1] He became a lecturer at King's College London in 1920 and took the chair of English at East London College (later Queen Mary's College) in 1923. In 1933 he went to Yale University as professor of the history of drama and dramatic criticism and chair of the drama department. He established a strong graduate programme in theatre history. Around 1943–45 he performed war work at the British embassy in Washington. From 1945 to 1961 he headed the English Department at the University of Birmingham; from 1951 to 1961 he was also founding director of the Shakespeare Institute at Birmingham. He served as president of the Society for Theatre Research from 1958 to 1976.