Thomas Blennerhassett ( fl. 1584–1611) was an English politician who sat in the House of Commons at various times between 1584 and 1611.

Blennerhassett may have been the son of Richard Blennerhassett, a member of the Carlisle Council in 1569. In 1584, Blennerhassett was elected Member of Parliament for Carlisle. He was re-elected MP for Carlisle in 1586. In 1597 he was Mayor of Carlisle. He was elected MP for Carlisle again in 1604. ^[1]

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