Lady Six Sky, also known as Lady Wac Chanil Ahau or Wak Chanil Ajaw, was a Maya queen of Naranjo who was born in Dos Pilas. She lived in Naranjo from 682 to her death in 741. During that time, she probably served as de facto ruler of the city; however, monuments such as Stela 24 suggest she was never formally recognized as such, since she continued to use the emblem glyph of Dos Pilas throughout her life.