Robert Emms (born Robert James MacPherson; 20 May 1986) is a British film, stage and television actor, known for portraying Pythagoras in the BBC One fantasy-adventure series Atlantis, Supervisor Lonni Jung in the Star Wars series Andor, and Leonid Toptunov in the HBO miniseries Chernobyl.
In June 2011, Screen International named him as a 'Star of Tomorrow'.
His other film work includes Kick-Ass 2 alongside Jim Carrey, and Rick 'Broken' Buckley in Broken directed by Rufus Norris for BBC films. He appeared as the Elizabethan era playwright Thomas Dekker in Anonymous directed by Roland Emmerich, in Tarsem Singh version of the Brothers Grimm's Snow White, Mirror Mirror with Julia Roberts, and in the BAFTA-nominated film The Arbor, directed by Clio Barnard. More recently he has portrayed Vitas Gerulaitis in the film Borg vs McEnroe directed by Janus Metz Pederson (alongside Shia LaBeouf).
Emms' notable television appearances include Happy Valley by Sally Wainwright, The Street by Jimmy McGovern, and Scott & Bailey. In 2015, Emms played the part of Smitty, the artistic grandson of Petunia Howe, in the three-part BBC series Capital based on John Lanchester's novel of the same name. He portrayed John Gerard in the 2017 BBC series Gunpowder alongside Kit Harington and Liv Tyler. He also played Pythagoras in the series Atlantis for the BBC.
Emms played Jack in (2018) and the third season of Jurassic World Camp Cretaceous (2021).
| 2010 | The Arbor | Young David | Clio Barnard |
| 2011 | War Horse | David Lyons | Steven Spielberg |
| 2011 | Anonymous | Thomas Dekker | Roland Emmerich |
| 2012 | Broken | Rick Buckley | Rufus Norris |
| 2012 | Mirror, Mirror | Charles Renbock | Tarsem Singh |
| 2013 | Kick-Ass 2 | Insect Man | Jeff Wadlow |
| 2013 | The Selfish Giant | Phil | Clio Barnard |
| 2017 | Borg/McEnroe | Vitas Gerulaitis | Janus Metz Pedersen |
| 2017 | Apostasy | Steven | Daniel Kokotajlo |
| 2018 | Tech Merc (Jack) | J. A. Bayona | |
| 2022 | This Is Christmas | Paul | Chris Foggin |
| 2023 | Starve Acre | Steven | Daniel Kokotajlo |
| 2025 | The Choral | Robert Horner | Nicholas Hytner |
| 2025 | Bad Apples | Josh | Jonatan Etzler |
| 2008 | Shangri-La | Horatio | 1 episode |
| 2008 | Waking the Dead | Steo | 1 episode |
| 2008 | The Wrong Door | Colin/Smee | 2 episodes |
| 2009 | The Street | Calum Miller | 1 episode |
| 2009 | Monday Monday | Tom | 1 episode |
| 2011 | Scott & Bailey | Luke Farrell | 1 episode |
| 2013–2015 | Atlantis | Pythagoras | Main role, 25 episodes |
| 2015 | Capital | Smitty | Miniseries, 3 episodes |
| 2016 | The Living and the Dead | Peter | 1 episode |
| 2016 | Happy Valley | Daryl Garrs | Main role, 4 episodes (Series 2) |
| 2017 | Gunpowder | Father John Gerard | Recurring role, 3 episodes |
| 2019 | Cleaning Up | Glynn | Main role |
| 2019 | Chernobyl | Leonid Toptunov | Miniseries, 5 episodes |
| 2019 | His Dark Materials | Thomas | 6 episodes |
| 2021 | Jurassic World Camp Cretaceous | Tech Merc (Jack) (voice) | Season 3, 1 episode |
| 2021 | War of the Worlds | Micah | 2 episodes |
| 2022 | Four Lives | Ricky | Miniseries, 3 episodes |
| 2022–2025 | Andor | Supervisor Lonni Jung | 10 episodes |
| 2023 | The Reckoning | Ray Teret | Miniseries, 3 episodes |
| 2024 | Kaos | Anatole | 3 episodes |
| 2024 | Sherwood | Samuel Warner | 6 episodes |
| 2007 | The Six-Days World | Tom | Jamie Harper | Finborough Theatre |
| 2008 | The Glee Club | Colin | Roger Haines | Library Theatre, Manchester |
| 2008 | Shangri-La | Horatio | Mark Ravenhill | Roundhouse |
| 2009–10 | War Horse | Albert Narracott | Marianne Elliott and Tom Morris | National Theatre at New London Theatre |
| 2009 | Billy Narracott | |||
| 2019–20 | Ravens: Spassky vs. Fischer | Bobby Fischer | Annabelle Comyn | Hampstead Theatre |
| 2023–24 | The Homecoming | Teddy | Matthew Dunster | Young Vic |
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