- Renée Zellweger Bridget Jones
- Colin Firth Mark Darcy
- Hugh Grant Daniel Cleaver
- Jim Broadbent Colin Jones (Papá)
- Gemma Jones Pam Jones (Mamá)
- Jacinda Barrett Rebecca
- Shirley Henderson Jude
- Sally Phillips Shazza
- James Callis Tom
- Neil Pearson Richard Finch
- Jessica Stevenson Robyn
- Celia Imrie Una
- Simón Andreu Sr. Santiago
- Rosalind Halstead Recepcionista
- Sam Hazeldine Periodista