Alicia Vikander as Vera Brittain

Kit Harington as Roland Leighton

Taron Egerton as Edward Brittain

Colin Morgan as Victor Richardson

Dominic West as Mr. Brittain

Emily Watson as Mrs. Brittain

Hayley Atwell as Hope Milroy

Anna Chancellor as Mrs. Leighton

Miranda Richardson as Miss Lorimer

Joanna Scanlan as Aunt Belle

Alexandra Roach as Winifred Holtby

Jenn Murray as Dorothy

Henry Garrett as George

Nicholas Le Prevost as Mr Leighton

Nicholas Farrell as Headmaster

Daisy Waterstone as Clare Leighton

Niamh Cusack as Sister Jones

Teresa Churcher as Passenger

Xavier Atkins as Boy on Bicycle

Heather Nicol as Celebrating Nurse

Laura Elsworthy as Nurse Scott

Naomi Everson as Nurse Milton

Jonathan Bailey as Geoffrey

Charlotte Hope as Betty

Josh Taylor as Wounded Solider

Paul Cavendish as Doctor (uncredited)