Ahlstedt is a surname. Notable people with this surname include:
Börje Ahlstedt (born 1939), a Swedish actor Emmy Ahlstedt (born 1981), Swedish politician Douglas Ahlstedt (1945 – 2023), an American tenor singer Fredrik Ahlstedt (1839 – 1901), a Finnish landscape and portrait painter Fredrik Ahlstedt (politician) (born 1968), Swedish politician Ida Aalle-Teljo (born "Ida Ahlstedt"; 1875 – 1955), a Finnish politician Nina Ahlstedt (1853 – 1907), another Finnish painter