---
name: "Jonjo O'Neill"
canonical: "https://film.one/person/jonjo-oneill"
roles: ["Actor"]
born: "11 July 1978"
reviewed_on_fi1m: 2
average_fi1m_score: 76
updated: "2026-09-17T04:10:32.036211+00:00"
licence: "© Fi1m Ltd. Written by AI under a human editor; checked against sources before publication. Quote with attribution and a link to the canonical URL."
---

# Jonjo O'Neill

Actor. Born 11 July 1978 in Belfast.

## Details

- **Work:** Actor
- **Born:** 11 July 1978, Belfast
- **Active:** 2018–present

## Biography

Jonjo O'Neill is a Northern Irish actor. He was born on 11 July 1978 in Belfast and trained at the Guildford School of Acting from 1996 to 1999. His early television appearances include a role in *Band of Brothers* (2001).

O'Neill was a member of the Royal Shakespeare Company ensemble from 2009 to 2011, appearing as Mercutio in *Romeo and Juliet* and in the title role of *Richard III* at the 2012 World Shakespeare Festival. He also performed in *The Effect* at the Royal National Theatre in 2012.

On screen, O'Neill has appeared in *The Ballad of Buster Scruggs* (2018), *The Queen's Gambit* (2020) as Mr. Ganz, *Doctor Who: The Day of the Doctor* (2013), *Bad Sisters* (2022) as Donal Flynn, *Operation Mincemeat* (2022), *Andor* (2022) as Captain Kaido, and *The Day of the Jackal* (2024).

*Sources: en.wikipedia.org, imdb.com, themoviedb.org.*

## On Fi1m (2)

- *Bad Sisters* (2022), Fi1m 78, as Donal Flynn — [page](https://film.one/tv/bad-sisters.md)
- *The Queen's Gambit* (2020), Fi1m 74, as Mr. Ganz — [page](https://film.one/tv/the-queens-gambit.md)

## Also credited on (not yet reviewed)

- *On Chesil Beach* (2018), Actor

## Also known for

- *The Ballad of Buster Scruggs* (2018), Englishman (segment "The Mortal Remains")
- *Homeland* (2011)
- *Defiance* (2008), Lazar
- *Constantine* (2014), Gary Lester
- *The Day of the Jackal* (2024), Edward Carver
- *Operation Mincemeat* (2022), Teddy
- *Doctor Who: The Day of the Doctor* (2013), McGillop
- *All the Old Knives* (2022), Ernst Pul

---
© Fi1m Ltd. Written by AI under a human editor; checked against sources before publication. Quote with attribution and a link to the canonical URL. Canonical: https://film.one/person/jonjo-oneill