| Simon August | |
| Prince of Lippe-Detmold | |
| Noble Family: | Lippe |
| Father: | Simon Henry Adolph, Count of Lippe-Detmold |
| Mother: | Johanna Wilhelmine of Nassau-Idstein |
| Spouse: | Princess Polyxena Louise of Nassau-Weilburg Princess Maria Leopoldine of Anhalt-Dessau Princess Casimire of Anhalt-Dessau Princess Christine of Solms-Braunfels |
| Issue: | Leopold I, Prince of Lippe |
| Birth Place: | Detmold |
| Death Place: | Detmold |
Simon August, Count of Lippe (12 June 1727 – 1 May 1782), ruled the Principality of Lippe-Detmold from 1734 until 1782.
He was born in Detmold, the son of Simon Henry Adolph and Johanna Wilhelmine of Nassau-Idstein. Simon August ruled until 1747 under the guardianship of his mother. Under the influence of the Enlightenment, he issued a fiscal and social legislation and in 1749 he introduced, together with Adolf von Hillensberg, a budget in Lippe, so as to not spend money when no revenues were available. The Sparkasse Detmold and a fire insurance company are direct continuations of companies he founded. He acquired a salt mine at Bad Salzuflen and built a spa in Bad Meinberg. In 1775, he created a relief fund for the poor. A census in 1776 revealed that his country had inhabitants.
In Kirchheimbolanden on 24 August 1750, Simon August married firstly with princess Polyxena Louise (Kirchheimbolanden, 27 January 1733 – Detmold, 27 September 1764), daughter of Charles August, Prince of Nassau-Weilburg. They had a daughter:
In Dessau on 28 September 1765 Simon August married secondly with princess Maria Leopoldine of Anhalt-Dessau (Dessau, 18 November 1746 – Detmold, 15 April 1769). They had a son:
In Dessau on 9 November 1769 Simon August married thirdly princess Casimire of Anhalt-Dessau (Dessau, 19 January 1749 – Detmold, 8 November 1778), sister of his previous wife. They had a son:
In Braunfels Castle on 26 March 1780 Simon August married fourthly princess Christine of Solms-Braunfels (Braunfels, 30 August 1744 – Detmold, 16 December 1823). They had no children
After his death at Detmold in 1782, his son Leopold I took up government.