Helga Nadire İnan Ertürk, aka Nadija Inan or Nadja Inan (born Helga Nadire İnan on September 10, 1984), is a Turkish-German women's football midfielder currently playing in the Turkish Women's Second Football League for Sakarya Yenikent Güneşspor in Turkey. She was a member of the Turkey women's national football team between 2008 and 2010.