Strathearn or Strath Earn (Scottish Gaelic: Srath Èireann) ( /stræθˈɜrn/; from Scottish Gaelic) is the strath of the River Earn, in Scotland. It extends from Loch Earn in Perth and Kinross to the River Tay.
"Strathearn" or "Strathern" is also a surname in the United States and Northern Ireland, predominantly in the Bellaghy area of County Londonderry.
The royal dukedom of Strathearn has occasionally been awarded to members of the British Royal Family. Prince William was created Earl of Strathearn, as a subsidiary title to Duke of Cambridge, on 29 April 2011, the day of his wedding to Catherine Middleton.