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 |
| Art | Gianpaolo Rifino | Assistant Art Director |
| Visual Effects | Justin Gladden | Visual Effects Producer |
| Editing | Jo Francis | Editor |
| Visual Effects | Ryan Delaney | Visual Effects Producer |
| Art | Laurence Bennett | Production Design |
| Art | Dimitri Capuani | Art Direction |
| Costume & Make-Up | Tracey Levy | Makeup Artist |
| Production | Paul Haggis | Producer |
| Art | Roberto Magagnini | Leadman |
| Camera | Gian Filippo Corticelli | Director of Photography |
| Art | Francesca Birri | Art Department Coordinator |
| Sound | Martin Jensen | Sound Re-Recording Mixer |
| Art | Raffaella Giovannetti | Set Decoration |
| Production | Elaine Grainger | Casting |
| Production | Paul Breuls | Producer |
| Sound | Stefan Henrix | Supervising Sound Editor |
| Sound | Forbes Noonan | Sound Re-Recording Mixer |
| Production | Michela Forbicioni | Casting |
| Production | Michael Nozik | Producer |
| Art | Briseide Siciliano | Assistant Art Director |
| Visual Effects | Alan Church | Visual Effects Producer |
| Camera | Alan Pierce | Camera Operator |
| Crew | Zack Mazerolle | Visual Effects Editor |
| Crew | Cian O'Laoi | Visual Effects Editor |
| Editing | Alex Yalakidis | First Assistant Editor |
| Crew | Julia Jones | Unit Publicist |
| Crew | Franco Maria Salamon | Stunt Coordinator |
| Editing | Paolo Buzzetti | First Assistant Editor |
| Visual Effects | David Shere | Visual Effects Supervisor |
| Camera | Fabrizio Vicari | Camera Operator |
| Editing | Yves Bertrand | First Assistant Editor |
| Sound | Chris Benstead | Music Editor |
| Production | Enrico Latella | Location Manager |
| Camera | Luigi Andrei | Camera Operator |
| Visual Effects | Shailendra Swarnkar | Visual Effects Supervisor |
| Costume & Make-Up | Cristina Tucci | Costume Supervisor |
| Crew | Joel Thompson | Visual Effects Editor |
| Camera | Maria Marin | Still Photographer |
| Directing | Rachel Griffiths | Script Supervisor |
| Lighting | Marco Sticchi | Gaffer |
| Sound | James Bellamy | Music Editor |
| Art | Luca Tranchino | Supervising Art Director |
| Costume & Make-Up | Melissa Mazzocco | Makeup Artist |
| Sound | Maggie Rodford | Music Supervisor |
| Art | Miki Kato | Title Designer |
| Costume & Make-Up | Massimo Gattabrusi | Hair Designer |
| Costume & Make-Up | Maurizio Silvi | Makeup Designer |
| Camera | David Rush Morrison | Second Unit Director of Photography |
| Sound | Peter Burgis | Foley Artist |
| Sound | Tim Hands | Supervising ADR Editor |
| Sound | Sue Harding | Foley Artist |
| Sound | Dario Marianelli | Original Music Composer |
| Sound | Brian Reed | ADR Recordist |
| Art | Sebastiano Murer | Property Master |
| Sound | Tim Hands | Supervising Dialogue Editor |
| Sound | Philip Clements | Foley Editor |
| Sound | Michael Miller | ADR Mixer |
| Camera | John Pardue | Second Unit Director of Photography |
| Sound | Juraj Mravec | Foley Supervisor |
| Production | Moran Atias | Producer |
| Crew | Steffen Geypens | Post Production Supervisor |
