| Year | Title | Role | Notes |
| 1995 | Smith & Jones | Various | Series 8; Episodes 1 & 3: "Bad Microphones" and "Missing Link" |
| Six Pairs of Pants | Various characters | Episodes 1–3. Also writer |
| 1995–1996 | Fist of Fun | Various | Series 1 & 2; 7 episodes |
| 1996 | It Happened Next Year | Various | Television film |
| 1997 | I'm Alan Partridge | Sophie | Series 1; Episodes 1–6 |
| Holding the Baby | Laura | Series 1; Episodes 2 & 7 |
| Cows | Pinky | Television film (Pilot for series that was cancelled) |
| 1998 | Comedy Nation | Various characters | |
| In the Red | Jemma White | Mini-series; Episodes 1–3 |
| You Are Here | Laura | Television film |
| 1999 | Kiss Me Kate | Natalie | Series 2; Episode 6: "On the Couch" |
| Hippies | Jill Sprint | Episodes 1–6 |
| 1999–2003, 2017 | Smack the Pony | Various characters | Series 1-4, and Comic Relief Special; 24 episodes. Also writer |
| 2002 | Rescue Me | Katie Nash | Episodes 1–6 |
| 2003 | Ready When You Are, Mr. McGill | Kelly | Television film |
| 2005 | French and Saunders | Nun | Christmas Celebrity Special |
| 2006 | Hyperdrive | Clare Winchester | Series 1; Episode 5: "Clare" |
| Green Wing | Holly Hawkes | Series 2; Episodes 4–7 |
| The Amazing Mrs Pritchard | Meg Bayliss | Episodes 2–6 |
| Seven Second Delay | Meredith | Television film |
| 2006–2009 | Jam & Jerusalem | Natasha "Tash" Vine | Series 1–3; 18 episodes |
| 2008 | Harley Street | Izzy | Episode 3 |
| Little Rikke | Mum (voice) | Television film |
| 2009 | Skins | Angela Moon | Series 3; Episode 4: "Pandora" |
| Svengali | Michelle | Television short film |
| 2009–2015 | Miranda | Tilly | Main character. Series 1–3, and 3 Specials; 15 episodes |
| 2010 | Abroad | Jemima Green | Television films |
| Accidental Farmer | Kat |
| 2011 | New Tricks | Samantha Gerson | Series 8; Episode 5: "Moving Target" |
| Justin's House | Wanda Round | |
| Moving On | Christina | Series 3; Episode 4: "Donor" |
| 2012 | Parents | Jenny Pope | Main character. Episodes 1–6 |
| Them from That Thing | Various | Mini-series; Episodes 1 & 2 |
| 2012–2020 | The Undateables | Herself - Narrator | Series 1–11; 45 episodes |
| 2013 | Chickens | Miss Trimble | Episode 5: "Leper" |
| Something Special | Herself - Special Guest | Series 5; 1 episode |
| 2013–2019 | Veep | Minna Häkkinen | Series 2, 3 & 5–7; 5 episodes |
| 2014 | The Supervet | Herself - Narrator | Series 1; Episodes 1–4 |
| 2015 | We're Doomed! The Dad's Army Story | Ann Croft | Television film |
| Death in Paradise | Cheryl Moore | Series 4; Episode 5: "Swimming in Murder" |
| House of Fools | Mary | Series 2; Episode 6: "The Whip Affair" |
| Distinguished Ladies | Bianca | Television film |
| 2016 | Galavant | Ivanna | Series 2; Episode 4: "Bewitched, Bothered, and Belittled" |
| Siblings | Aunt Leslie | Series 2; Episode 2: "Golden Aunt" |
| Mid Morning Matters with Alan Partridge | Charlie Moran (voice) | Series 2; Episode 5: "Massage + Royal Visit" |
| Midsomer Murders | Lucy Keswick | Series 19; Episode 1: "The Village That Rose from the Dead" |
| Drunk History | Mary | Series 3; Episode: "Christmas Special" |
| A World Without Down's Syndrome? | Herself - Presenter | BBC Documentary film |
| 2016–2018 | Zapped | Slasher Morgan | Series 1–3; 6 episodes |
