Isobel Armstrong FBA (born 1937) is a British academic. She is Emeritus Professor of English at Birkbeck, University of London and a Senior Research Fellow of the Institute of English Studies at the University of London.

She is a critic of nineteenth-century poetry, literature and women's writing. Her publications include The Radical Aesthetic (2000), Women's Poetry, Late Romantic to Late Victorian: Gender and Genre (1999) and Victorian Poetry: Poetry, Politics and Poetics (1993). She is also a published poet.

She is a Fellow of the British Academy.

Her older sister is the writer Diana Wynne Jones.

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