Kate Beckinsale as Lady Susan Vernon

Xavier Samuel as Reginald DeCourcy

Morfydd Clark as Frederica Vernon

Emma Greenwell as Catherine DeCourcy Vernon

Tom Bennett as Sir James Martin

James Fleet as Sir Reginald DeCourcy

Jemma Redgrave as Lady DeCourcy

Justin Edwards as Charles Vernon

Stephen Fry as Mr. Johnson

Chloë Sevigny as Alicia Johnson

Jenn Murray as Lady Lucy Manwaring

Lochlann Ó Mearáin as Lord Manwaring

Sophie Radermacher as Miss Maria Manwaring

Jordan Waller as Edward, Head Footman

Ross Mac Mahon as Owen

Kelly Campbell as Mrs. Cross

Conor Lambert as Wilson the Butler

Conor MacNeill as The Young Curate

Frank Melia as Coachman

Sylvie Benoiton as Vernon Child

Daniel Magee as Vernon Child

Rowan Finken as Footman at Churchill

Dave Timbs as Footman at Churchill

Laura Whelan as Maid at Churchill

James Crerar as Footman at Churchill

John Brennan as Footman at Edward Street

Olivia Fahy as Maid at Edward Street

Ellie Houlihan as Maid at Edward Street

Carla McGlynn as Maid at Upper Seymour Street

Darragh O'Connor as Stable Boy

Frank Prendergast as Approaching Gentleman