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Countess of Devon is a title that may be held by a woman in her own right or used by the wife of the Earl of Devon. Women who have held the title include:

Countesses in their own right

• Isabel de Forz, suo jure 8th Countess of Devon (1237–1293)

Countesses by marriage

• Adelize de Baalun (d. c. 1146)
• Amice de Clare (c. 1220–1284)
• Margaret de Bohun (1311–1391)
• Margaret Beaufort (c. 1409–1449)
• Catherine of York (1479–1527)
• Allison Joy Langer (born 1974)