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| Toni Collette | Fiona Brewer | |
| Hugh Grant | Will | |
| Jordan Cook | Imogen | |
| Madison Cook | Imogen | |
| Nicholas Hoult | Marcus Brewer | |
| Nicholas Hutchison | John | |
| Sharon Small | Christine | |
| Joseph Speechley | Barney | |
| Ryan Speechley | Barney | |
| Rachel Weisz | Rachel | |
| Nat Gastiain Tena | Ellie | |
| Isabel Brook | Angie | |
| Victoria Smurfit | Susie | 
| Director | 
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| Producer | Tim Bevan Eric Fellner | ||||
| Writer | Paul Weitz Nick Hornby | ||||
| Cinematography | Remi Adefarasin | ||||
| Musician | Damon Gough | 
| "About a Boy" features Hugh Grant as Will, a 40ish man who has no responsibility and does not want any. He lives off the royalties of a Christmas song his father wrote years ago. After dating a single mom, he decides that they are the future of dating. To meet single mothers, he joins S.P.A.T. (Single Parents Alone Together), a single parent support group, by pretending that he has a two year old son. Through the group, he meets Marcus Brewer, a dorky preteen who does not fit in at his new school and is struggling with his mother's battle with depression. | 
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