Thomas Cathern

{{short description|16th-century Welsh politician}}

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{{Use British English|date=December 2016}}

Thomas Cathern, Gadarn or Gatharne (by 1519 – 1565 or later), of Prendergast, Pembrokeshire, was a Welsh politician.

Cathern was a Member (MP) of the Parliament of England for Pembrokeshire in 1558.{{cite web|url=http://www.historyofparliamentonline.org/volume/1509-1558/member/cathern-(gadarn-gatharne)-thomas-1519-65-or-later|title=CATHERN (GADARN, GATHARNE), Thomas (by 1519-65 or later), of Prendergast, Pemb. - History of Parliament Online|website=www.historyofparliamentonline.org}}