Pieter Jelles Troelstra (Leeuwarden, 20 April 1860 – The Hague, 12 May 1930) was a Dutch politician active in the socialist workers' movement. He is most remembered for his fight for universal suffrage and his failed call for revolution at the end of World War I. Troelstra was married from 1888 until 1904 to Sjoukje Bokma de Boer, who was a well-known children's book writer under the pen name of Nynke van Hichtum.