James Douglas, 2nd Duke of Queensberry and 1st Duke of Dover was a Scottish nobleman and a leading politician of the late 17th and the early 18th centuries. As Lord High Commissioner he was instrumental in negotiating and passing the Acts of Union 1707 with England, which created the Kingdom of Great Britain.

The Lord High Commissioner to the Parliament of Scotland was the monarch of Scotland's personal representative to the Parliament of Scotland. From the accession of James VI of Scotland to the throne of England in 1603, a Lord High Commissioner was appointed from among the senior nobility to represent the Scottish monarch in parliament when he or she was absent, as was usually the case up to 1707. The Act of Union 1707, which merged the Parliament of Scotland and the Parliament of England to create the Parliament of Great Britain, rendered the post redundant.