Stieneke Jannieta Femmelien van der Graaf (born 7 October 1984) is a Dutch politician and jurist who served thrice as a member of the House of Representatives between 2017 and 2023 for the Christian Union (CU). In 2025 she was appointed Acting Mayor of Weststellingwerf.
She held a seat in the House from 2017 to 2021, with a brief interruption in 2019, when she was replaced by Nico Drost during her maternity leave. She returned in 2022 to take Carola Schouten's seat again, following Schouten's re-appointment to the government. Van der Graaf started her political career in 2007 as party leader in the Provincial Council of Groningen, holding her seat until 2017.