William Trewynnard

{{Short description|English politician}}

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{{Use British English|date=December 2017}}

William Trewynnard (by 1495 – 1549), of Trewinnard, Cornwall, was an English politician.

He was a Member (MP) of the Parliament of England for Helston in 1542.{{cite web|url=http://www.historyofparliamentonline.org/volume/1509-1558/member/trewynnard-william-1495-1549|title=TREWYNNARD, William (by 1495-1549), of Trewinnard, Cornw. - History of Parliament Online|website=www.historyofparliamentonline.org}}

He was robbed and his estates despoiled during the Prayer Book Rebellion in 1549, when he was mortally wounded by rebels when trying to shelter at St Michael's Mount.