Delia Mathews was born in New Zealand and started her ballet training at The Dance Education Centre in Tauranga before moving to London to study at The Royal Ballet School. She joined Birmingham Royal Ballet in 2008 after graduating from the school and was promoted to Principal in 2017.

Her repertoire includes Odette/Odile in Swan Lake, Aurora in The Sleeping Beauty, Juliet in Romeo and Juliet, Title role in Cinderella, The Sugar Plum Fairy in The Nutcracker, Natalia Petrovna in A Month in the Country, In The Upper Room as well as creating roles in works by David Bintley, Alexander Whitley and Jessica Lang.