Joan Johanna d'Olnay Throckmorton Baroness Smyth de Cromwell 1
- Born: 1440, Hackthorpe, Lincs, England
- Marriage (1): Sir Knight John Walte Smyth de Cromwell Baron of Carlton
- Died: 1474, Narwali, Nottinghamshire, England at age 34
Joan married Sir Knight John Walte Smyth de Cromwell Baron of Carlton, son of Willem Cromwell and Margaretha Smyth. (Sir Knight John Walte Smyth de Cromwell Baron of Carlton was born in 1435 in Narwalli, Nottinghamshire, England and died in 1480 in Valley of the Wandle, London, England.)
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