Harriet Hilliard Nelson (otherwise known as Peggy Lou Snyder) (1909 - 1994) was an American singer and actress.

Born Peggy Lou Snyder in Des Moines, Iowa, in 1932 she was performing in vaudeville when she met the saxophone-playing Ozzie Nelson and was hired by him as vocalist for his orchestra. They married three years later and with him and their children, Ricky Nelson and David Nelson , she starred in the highly popular radio and television series The Adventures of Ozzie and Harriet between 1944 and 1966.

She is interred with her husband and son Ricky in the Forest Lawn - Hollywood Hills Cemetery in Los Angeles, California.