Daisy Elitha Peterson Sweeney (May 7, 1920 – August 11, 2017) was a Canadian classical music and piano teacher, known for having taught many of the most notable figures in Canadian jazz music. Sweeney was born Daisy Peterson in Montreal in 1920. Her students included Oliver Jones, Ken Skinner, Joe Sealy, Reg Wilson, and her brother, Oscar Peterson. Sweeney would take her students to McGill University for preparatory exams and performances.