Tom Hollander as Dylan Thomas

Essie Davis as Caitlin Thomas

Phoebe Fox as Liz Reitell

Ewen Bremner as John Malcolm Brinnin

Celt Llewelyn-Jones as Young Dylan

Jamie Ballard as Jerry Hart

Demetri Goritsas as Dr Milton Feltenstein

Samantha Coughlan as Sylvie

Naomi Everson as Rollie McKenna

Jason May as Longshoreman

Robert Blythe as Dylan's Dad

Sharon Morgan as Dylan's Mam

Nansi Rhys Adams as Aeronwy Thomas

Robbie Lester as Roy Poole

Morfydd Clark as Nancy Wickwire

Lucinda O'Donnell as Brazelle

Gruffydd Weston as Skully

Wanda Opalinska as Countess

Aimee-Ffion Edwards as Marianne

Celyn Jones as Felix Gertsman

Kate Jarman as Nurse

Stuart Matthews as Theatre Stagehand (uncredited)

Shane Hart as Audience (uncredited)

Richard Hall as Stage Prompter (uncredited)

Marina Baibara as Nadia (uncredited)