The Sound of Music Live! is a two-and-a-half-hour TV dramatisation of the popular musical, and will star Kara Tointon as Maria.
Julian Ovenden will play Captain Georg von Trapp, while Katherine Kelly and Alexander Armstrong are announced as Baroness Elsa Schraeder and Max Detweiler respectively.
Richard Valentine is directing the project, which will include all of the songs from the classic soundtrack including 'How Do You Solve a Problem Like Maria' and 'My Favourite Things'.
ITV's director of entertainment and comedy Elaine Bedell said: "This is the first time in the UK that this type of project has been attempted - a musical drama both performed and broadcast live - but big ambitious live television events is what ITV does well.
"We've assembled some of the very best talent both in front of and behind the camera,