Cassandra Steen (born February 9, 1980 in Ostfildern, Baden-Württemberg, West Germany) is a German-American singer, songwriter, and voice actress, who rose to fame as the lead singer of the trio Glashaus.

After a series of commercially successful releases with the group, Steen released her moderately successful solo debut album Seele mit Herz in 2003. After her departure from Glashaus and a label change to Universal Urban Records in 2007, she released her second album Darum leben wir in February 2009. A gold-certified the top ten success, it spawned three singles, including "Stadt," the fourth biggest-selling single of 2009 in Germany. In 2010, she won the ECHO Award for Best National Artist Rock/Pop.