My Left Nut is a British comedy-drama television miniseries produced by Rollem Productions for BBC Three.^[1][2] Based on the stage-play of the same name by Michael Patrick & Oisín Kearney,^[3] and drawing heavily on Patrick's own teenage years,^[4] the series follows 15-year old Mick (Nathan Quinn O'Rawe) as he discovers a swelling on his left testicle. The series was written by Patrick and Kearney and directed by Paul Gay.^[5]

The series was released on BBC Three and BBC iPlayer in the United Kingdom on 1 March 2020,^[6] followed by weekly airings on BBC One.

The series follows teenager Mick as he attempts to deal with his home and school life after discovering a swelling on his left testicle. His father having died years previously, Mick confides in his mother (Sinead Keenan) as he plucks up the courage to go to the doctor - all whilst trying to keep his swollen testicle from his friends Tommy and Conor, and his prospective girlfriend Rachael.

• Nathan Quinn O'Rawe as Michael "Mick" Campbell.
• Sinead Keenan as Patricia Campbell, Mick's mother.
• Brian Milligan as Jimmy Campbell, Mick's dead father.
• Jessica Reynolds as Rachael, Mick's prospective girlfriend.
• Levi O'Sullivan as Conor, Mick's friend.
• Oliver Anthony as Tommy, Mick's friend.
• Sade Malone as Siobhan, Rachael's friend.
• Lola Petticrew as Lucy, Mick's sister.
• Jay Duffy as Danny, Lucy's boyfriend.
• Odhran Carlin as Finn, Mick's brother.
• Roger Thomson as Dr Gibbon, Mick's GP
• Gerard Jordan as Tommy's da.

Micheal Patrick and Oisín Kearney originally wrote My Left Nut as a one man show through the 'Show in a Bag' initiative run by Fishamble: The New Play Company in partnership with Dublin Fringe Festival and The Irish Theatre Institute.^[7] The theatre play was a semi-fictionalised version of Patrick's teenage years growing up in Belfast with a swollen testicle,^[8] it premiered at the Dublin Fringe 2017 before showing at Summerhall as part of Edinburgh Festival Fringe 2018.^[9][10] At the same time, Patrick and Kearney were part of BBC Writers' Room Belfast Voices, through which they pitched the idea of adapting their play for television to Rollem Productions.^[3]

Principal photography began on location in Belfast in August 2019. Specific locations in Belfast included St Mary's Christian Brothers' Grammar School, the Strand Cinema, Belfast Harbour and Ormeau Road.^[11]

The show received generally positive critical reviews, getting particular praise for its blend of comedy and drama, being described as "equal parts charmingly funny and strangely sincere" by The Guardian,^[12] and being compared favourably to similar series such as Derry Girls and The Inbetweeners. Liam Fay in The Sunday Times said: "There are echoes of everything from The Inbetweeners to Derry Girls, but the show has its own distinctive voice."^[13]

My Left Nut won Best Drama at the 2020 Royal Television Society Northern Ireland Awards ^[14] and won Best Drama, Best Writers (Michael Patrick & Oisín Kearney) and Best Actor (Nathan Quinn O'Rawe) at the 2021 Royal Television Society Yorkshire Awards.^[15] It was also nominated for Best Drama at the 2020 Broadcast Digital Awards.^[16]