Nadia Santos is a fictional character in the television series Alias, and a main character during the series' fourth season. She is played by Mía Maestro.

The fourth season of the American drama/adventure television series Alias premiered January 5, 2005 on ABC and concluded May 25, 2005 and was released on DVD in region 1 on October 25, 2005. Guest stars in season four include Sônia Braga, Joel Grey, Michael McKean, Lena Olin, and Isabella Rossellini.