James Bavington Jeffreys (c. 1679 – 1739), also recorded as Jeffereys, was an Anglo-Irish soldier and diplomat who served as Minister Resident of the Kingdom of Great Britain to Sweden and Russia.
He returned to Sweden in 1702 and became an agent in the service of Dr John Robinson, the English representative in Stockholm.
[1] On 12 April 1706 Jeffreys received a captaincy in the army of Queen Anne, after his father petitioned the Duke of Marlborough on his son's behalf.
In the spring of 1707, he was authorised by Anne to become a volunteer in the army of Charles XII of Sweden and participated in the Swedish invasion of Russia.
Jeffreys was captured by the Russians following the Battle of Poltava on 8 July 1709, but released the same year.