De film heeft drie verhaallijnen in drie verschillende steden die allemaal met elkaar zijn verbonden. Parijs: Michael, een schrijver die onlangs zijn vrouw heeft verlaten, krijgt bezoek van zijn geliefde Anna. Vanwege een vreselijk geheim is Anna niet in staat zich te binden met Michael, wat resulteert in een ingewikkelde knipperlichtrelatie. New York: Julia is onlangs beschuldigd van poging tot moord op haar zoon. Haar zoon woont hierdoor nu bij zijn vader maar Julia stelt alles in het werk om de voogdij terug te krijgen. Rome: Sean, een Amerikaanse zakenman op weg naar Italië, wordt verliefd op de Italiaanse Monica. Hij raakt hierdoor betrokken bij de zaak van Monica's dochter, die ontvoerd is door een Italiaanse crimineel en wordt vastgehouden voor losgeld.
Nee, helaas is Third Person nog niet beschikbaar op Netflix in Nederland.
| Costume & Make-Up | Sonu Mishra | Costume Supervisor |
| Directing | Paul Haggis | Director |
| Writing | Paul Haggis | Screenplay |
| Production | Paul Breuls | Producer |
| Production | Paul Haggis | Producer |
| Production | Michael Nozik | Producer |
| Camera | Gian Filippo Corticelli | Director of Photography |
| Editing | Jo Francis | Editor |
| Production | Elaine Grainger | Casting |
| Art | Laurence Bennett | Production Design |
| Art | Dimitri Capuani | Art Direction |
| Art | Raffaella Giovannetti | Set Decoration |
| Costume & Make-Up | Tracey Levy | Makeup Artist |
| Art | Francesca Birri | Art Department Coordinator |
| Art | Gianpaolo Rifino | Assistant Art Director |
| Art | Briseide Siciliano | Assistant Art Director |
| Art | Roberto Magagnini | Leadman |
| Sound | Martin Jensen | Sound Re-Recording Mixer |
| Sound | Forbes Noonan | Sound Re-Recording Mixer |
| Sound | Stefan Henrix | Supervising Sound Editor |
| Visual Effects | Alan Church | Visual Effects Producer |
| Visual Effects | Ryan Delaney | Visual Effects Producer |
| Visual Effects | Justin Gladden | Visual Effects Producer |
| Crew | Zack Mazerolle | Visual Effects Editor |
| Crew | Cian O'Laoi | Visual Effects Editor |
| Crew | Joel Thompson | Visual Effects Editor |
| Visual Effects | David Shere | Visual Effects Supervisor |
| Visual Effects | Shailendra Swarnkar | Visual Effects Supervisor |
| Crew | Franco Maria Salamon | Stunt Coordinator |
| Camera | Luigi Andrei | Camera Operator |
| Camera | Fabrizio Vicari | Camera Operator |
| Camera | Alan Pierce | Camera Operator |
| Camera | Maria Marin | Still Photographer |
| Lighting | Marco Sticchi | Gaffer |
| Production | Michela Forbicioni | Casting |
| Costume & Make-Up | Cristina Tucci | Costume Supervisor |
| Editing | Yves Bertrand | First Assistant Editor |
| Editing | Alex Yalakidis | First Assistant Editor |
| Editing | Paolo Buzzetti | First Assistant Editor |
| Sound | James Bellamy | Music Editor |
| Sound | Chris Benstead | Music Editor |
| Directing | Rachel Griffiths | Script Supervisor |
| Crew | Julia Jones | Unit Publicist |
| Production | Enrico Latella | Location Manager |
| Art | Luca Tranchino | Supervising Art Director |
| Costume & Make-Up | Melissa Mazzocco | Makeup Artist |
| Costume & Make-Up | Massimo Gattabrusi | Hair Designer |
| Costume & Make-Up | Maurizio Silvi | Makeup Designer |
| Art | Miki Kato | Title Designer |
| Sound | Maggie Rodford | Music Supervisor |
| Camera | David Rush Morrison | Second Unit Director of Photography |
| Camera | John Pardue | Second Unit Director of Photography |
| Art | Sebastiano Murer | Property Master |
| Sound | Tim Hands | Supervising Dialogue Editor |
| Sound | Tim Hands | Supervising ADR Editor |
| Sound | Dario Marianelli | Original Music Composer |
| Sound | Sue Harding | Foley Artist |
| Sound | Peter Burgis | Foley Artist |
| Sound | Michael Miller | ADR Mixer |
| Sound | Juraj Mravec | Foley Supervisor |
| Sound | Philip Clements | Foley Editor |
| Sound | Brian Reed | ADR Recordist |
