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Zawedde Emma Muwanga-Ashton (; born 25 July 1984) is a British actress and playwright. She gained recognition for her roles in the comedy dramas Fresh Meat and Not Safe for Work, the Netflix horror thriller film Velvet Buzzsaw, and for her portrayal of Joyce Carol Vincent in Dreams of a Life (2011). She also portrayed Dar-Benn in The Marvels (2023).
| Year | Title | Role | Notes |
| 2009 | St. Trinian's II: The Legend of Fritton's Gold | Bianca | |
| 2011 | Blitz | WPC Elizabeth Falls | |
| Weekender | Sarah | ||
| Dreams of a Life | Joyce Vincent | ||
| 2014 | The Place We Go to Hide | — | Director only; short film |
| Happy Toys | — | Director only; short film | |
| 2016 | Nocturnal Animals | Alex | |
| 2018 | Greta | Alexa Hammond | |
| 2019 | Velvet Buzzsaw | Josephina | |
| 2022 | Mr. Malcolm's List | Julia Thistlewaite | |
| 2023 | The Marvels | Dar-Benn | |
| 2024 | All of You | Andrea |
| Year | Title | Role | Notes |
| 1995 | Game On | Little Girl | Episode: "Bad Timing" |
| 1996 | The Demon Headmaster | Rebecca | 2 episodes |
| 2000 | The Bill | Kylie | Episodes: "Meltdown: Part 2 & Part 3" |
| 2002 | In Deep | Jade | 2 episodes |
| 2003 | Holby City | Abigail Meredith | Episode: "Crossing the Line" |
| 2007 | Mobile | Eyewitness | 2 episodes |
| 2008 | The Bill | Becka Adams | Episode: "Gun Runner: Under Cover" |
| 2009 | Casualty | Gina | Episode: "True Lies" |
| 2010 | Sherlock | Sally Donovan | Episode: unaired pilot |
| Misfits | Jessica | Episode: "#2.5" | |
| 2011 | Lapland | Jingle Jill | Television film |
| 2011–2013 | Case Histories | Deborah Arnold | Main role |
| 2011–2016 | Fresh Meat | Violet "Vod" Nordstrom | Main role |
| 2014 | Doctor Who | Journey Blue | Episode: "Into the Dalek" |
| 2014–2019 | 24 Hours in Police Custody | Narrator | Documentary series |
| 2015 | Not Safe For Work | Katherine | Main role |
| 2017 | Guerrilla | Omega | Miniseries |
| Sarah & Duck | Hairdresser | Episode: "Hair Cut" | |
| 2018 | Wanderlust | Claire Pascal | 5 episodes |
| 2021 | The Handmaid's Tale | Oona | 3 episodes |
| 2021 | Spice Girls: How Girl Power Changed Britain | Narrator | 3 episodes |
| 2022 | Maryland | Mary | Television film |
| 2023 | Mog's Christmas | Mrs Gaynor (voice) | Animated television short film |
| 2024 | Paid in Full: The Battle for Black Music | Narrator | British broadcast only; original version narrated by Jully Black. |
| Year | Title | Role | Venue | Notes | mw- Ref. |
| 2007 | Othello | Bianca | The Globe | ||
| Rhinoceros | Daisy | Royal Court | |||
| The Arsonists | Anna | Royal Court | |||
| The Cage | Nicola | Nuffield Theatre | |||
| 2008 | Gone Too Far! | Armani | Royal Court | ||
| The Front Line | Casey | The Globe | |||
| 2009 | All The Little Things We Crushed | Zoe | Almeida Theatre | ||
| This Wide Night | Marie | Soho Theatre | |||
| 2010 | Salome | Salome | Curve Theatre | ||
| The Children's Monologues | — | The Old Vic / Royal Court Theatre | Writer only | ||
| 2012 | Here | Cath | Rose Theatre | ||
| 2015 | Splendour | Gilma | Donmar Warehouse | ||
| 2016 | The Maids | Claire | Trafalgar Studios | ||
| 2018 | The Hardest Rain | — | The Old Vic | Writer only | |
| 2019 | For All the Women Who Thought They Were Mad | — | Hackney Showroom / Soho Repertory Theatre | Writer only | |
| Betrayal | Emma | Harold Pinter Theatre / Bernard B. Jacobs Theatre |