Ulrik Adolf Holstein, Count of Holsteinborg (14 April 1664 – 21 August 1737) was a Danish nobleman and statesman.
In 1679 he became a page to Crown Prince Frederick and found favour, becoming a Freiherr in 1700. He was removed from court in 1703 after attempting to dissuade the King from marrying Elisabeth Helene von Vieregg, becoming a bailiff in Flensburg, but was appointed Geheimrat in 1703 and Count of Holsteinborg in 1708.
He married Christine Reventlow, and in 1712 helped the King to abduct his wife's sister Anne Sophie Reventlow. He was sent on a diplomatic mission to England in 1718, appointed to the Cabinet in 1719. His sister-in-law became Queen in 1721, and Holstein was appointed Grand Chancellor. He was removed from office on the King's death in 1730.