Richard Curtis Director, Screenwriter, Executive Producer Domhnall Gleeson Tim Actor Rachel McAdams Mary Actor Bill Nighy Dad Actor Tom Hollander Harry Actor Margot Robbie Charlotte Actor Lindsay Duncan Mum Actor Lydia Wilson Kit Kat Actor Richard Cordery Uncle D Actor Will Merrick Jay Actor Lisa Eichhorn Mary's Mum Actor Tom Hughes Jimmy Kincade Actor Tim Bevan Producer Eric Fellner Producer Nicky Kentish Barnes Producer Liza Chasin Executive Producer Amelia Granger Executive Producer John Guleserian Cinematographer Mark Day Film Editing Nick Laird-Clowes Original Music John Paul Kelly Production Design David Hindle Supervising Art Direction Sam Stokes Art Director Liz Griffiths Set Decoration Verity Hawkes Set Decoration Fiona Weir Casting