
Kemsley began stand-up in 2011 and within months won the Funny's Funny contest. In 2012, she won Bath Comedy Festival New Act of the Year and Brighton Comedy Festival New Act of the Year and was named by Rhod Gilbert as one of the Ten Must See Comics of 2012. Her autobiographical solo show, Slutty Joan, was reviewed positively in The Guardian. She hosts a podcast, Why Is Harriet Crying?, with fellow comedian Sunil Patel. Kemsley has appeared on Sam Delaney's News Thing, Roast Battle, 8 Out of 10 Cats Does Countdown and 8 Out of 10 Cats. She and then-fiancé Bobby Mair appeared on a Viceland reality show in 2017, entitled Bobby & Harriet Get Married, featuring their wedding, officiated by comedian Romesh Ranganathan. As an actress, she has appeared in the film Bonobo and on TV on Damned and Doctor Foster. She also provided the voice of Nashandra, the final boss of the video game Dark Souls II.

Grave New World

Never Mind the Buzzcocks

Would I Lie to You?

Live at the Apollo

8 Out of 10 Cats Does Countdown

LOL: Last One Laughing UK

Alan Davies: As Yet Untitled

8 Out of 10 Cats

Roast Battle

Battle In The Box

Out of Order

The Ranganation

Pointless Celebrities

Hypothetical

Richard Osman's House of Games

Bobby and Harriet Get Married

The Weakest Link

Guessable

The Last Leg

Michael McIntyre's The Wheel

The Jonathan Ross Show

The Great British Bake Off: An Extra Slice

This Is My House

Iain Stirling's Roast The Internet

Bonobo

Big Brother: Late & Live

Harriet Kemsley: Woman Child

Harriet Kemsley: Everything Always Works Out For Me

You Build The Thing You Think You Are

Clash of the Comics

Hamleys: Top 100 Toys of All Time

Pants on Fire

Comedy Central at the Comedy Store

MAFS UK: It's Official!