Remlingen-Semmenstedt is a municipality in the district of Wolfenbüttel, in Lower Saxony, Germany. It was formed on 1 November 2016 by the merger of the former municipalities Remlingen and Semmenstedt.

Five villages belong to the municipality (population 2022):

• Remlingen (1282)
• Semmenstedt (482)
• Groß Biewende (295)
• Klein Biewende (200)
• Timmern (172)