Tilloy-lez-Marchiennes (, literally Tilloy near Marchiennes) is a commune in the Nord department in the Hauts-de-France region, Northern France. As of 2023, the population of the commune was 536.
In March 2020, Marie Cau won a majority of votes in the first round of the mayoral election (with the entire municipal council also being members of her electoral list) on a platform of developing social and environmental policies like sustainable agriculture. Her inauguration was delayed until May due to the COVID-19 pandemic. Her election as the first known openly transgender mayor in France garnered international media coverage. She stepped down in January 2025, and was succeeded by Catherine Vandewalle.