| Landgravine Juliane of Hesse-Philippsthal | |
| Noble Family: | House of Lippe |
| Father: | William, Landgrave of Hesse-Philippsthal |
| Mother: | Ulrike Eleonore of Hesse-Philippsthal-Barchfeld |
| Spouse: | Philip II, Count of Schaumburg-Lippe |
| Issue: | George William, Prince of Schaumburg-Lippe |
| Birth Place: | Zutphen |
| Death Place: | Bückeburg |
Juliane of Hesse-Philippsthal (8 June 1761 – 9 November 1799), was a countess of Schaumburg-Lippe, married in 1780 to Count Philip II, Count of Schaumburg-Lippe. She served as the regent of Schaumburg-Lippe during the minority of her son from 1787 to 1799.
Juliane was the daughter of Landgrave William of Hesse-Philippsthal (1726–1810) and his wife Ulrike Eleonore, Landgravine of Hesse-Philippsthal-Barchfeld (1732–1795). She spent some of her youth in 's-Hertogenbosch, where her father served as a Dutch general. She received a German education.
On 10 October 1780 she married in Philippsthal to Count Philip Ernest of Schaumburg-Lippe. Philipp Ernst, who was 57 years old at the time and already a widower, died after only seven years of marriage. Countess Juliane took up government, together with Count Johann Ludwig, Reichsgraf von Wallmoden-Gimborn as regent for her minor son George William. Immediately afterwards, Landgrave William of Hesse-Kassel occupied Schaumburg-Lippe militarily, arguing it was a fief of Hesse, and vacant after Philip II's death. With support from Hanover, Prussia and the Imperial Council, Juliane managed to achieve a rapid withdrawal of the Hessian troops.
The Government of Juliane is considered extremely beneficial. She conducted thorough reforms of the economy and education, downsized the court, continued the tolerant policy towards the Jews her father-in-law had introduced and managed to cut taxes. She appointed Bernhard Christoph Faust as her personal physician, and helped him significantly with the introduction of the smallpox inoculation.
Juliane initiated a redesign of Hagenburg Castle and she is considered the founder of the spa Bad Eilsen.
She died after a severe cold and was buried in a mausoleum in the Schaumburg Forest. Count von Wallmoden-Gimborn continued to act as a regent for her son.