Lev Ivanovich Ivanov was a Russian ballet dancer and choreographer and later, Second Balletmaster of the Imperial Ballet. As a performer with the Imperial Ballet, he achieved prominence after performing as an understudy in a benefit performance of La Fille Mal Gardée. He is most famous as the choreographer of Acts II and IV of Swan Lake, which include the Dance of the Little Swans, Act II of Cinderella, and The Nutcracker, which he choreographed alongside Marius Petipa.