John Mounsher (16 July 1665 – by December 1702) was an English businessman and politician.
He was the son of Andrew Mounsher (or Mounser) of Portsmouth, a ropemaker.
He continued the rope business and was involved in local politics, becoming an Alderman in 1695 and serving as Mayor of Portsmouth in 1696 and 1700.
He was elected a Member of Parliament (MP) for Hastings in 1701, sitting until 1702.
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