Baron Blythswood, of Blythswood in the County of Renfrew, was a title in the Peerage of the United Kingdom. It was created on 24 August 1892 for Sir Archibald Campbell, 1st Baronet, the former Member of Parliament for Renfrew, with remainder failing heirs male of his own to five of his younger brothers and the heirs male of their bodies.

Lieutenant-Colonel Archibald Campbell, 1st Baron Blythswood, was a Scottish soldier, Tory politician, scientist and Grand Master of the Grand Lodge of Scotland.