Prince of Eulenburg Philipp
- Category : 1847-births
- Type : PSP
- Profile : 5/1 - Heretical / Investigator
- Definition : Single
- Incarnation Cross : LAX Revolution 1
German diplomat and composer who achieved considerable influence as the closest friend of Kaiser Wilhelm II. He was the central member of the so-called Liebenberg Circle, a group of artistically minded German aristocrats within Wilhelm's entourage. Eulenburg played an important role in the rise of Bernhard von Bülow, but fell from power in 1907 due to the Harden–Eulenburg affair when he was accused of the then crime of homosexuality.
On 20 November 1875, at Stockholm, Eulenburg married Augusta Sandels (Stockholm, 12 May 1853 – Liebenberg, 14 December 1941). They had eight children.
Although he was married, Eulenburg was connected in homosexual liaisons with members of the Kaiser's inner circle, including Count Kuno von Moltke, the military commander of Berlin. Sources say that he continued to have homosexual relationships even after the marriage. The public exposure of these liaisons in 1906 led to the Harden-Eulenburg Affair.
Eulenburg died on 17 September 1921, aged 74, in Liebenberg, Germany.