Mark Bonnar has carved a niche as the go-to actor for quietly authoritative figures in British crime dramas—DCC Mike Dryden in Line of Duty, detective Duncan Hunter in Shetland, and Max in the psychological thriller Guilt. His career spans two decades across BBC, ITV, Channel 4, and streaming platforms.

4 related posts

Born: 19 November 1968 · Birthplace: Edinburgh, Scotland · Known Role in Guilt: Max · Known Role in Shetland: Duncan Hunter · Known Role in Line of Duty: Mike Dryden

Quick snapshot

1Confirmed facts
2What’s unclear
  • Whether a single show stands above the others as his “most famous”
  • Exact episode counts for some supporting roles across early career
3Timeline signal
  • On-screen debut in Rebus (2001) → ongoing roles in 2025 (Wikipedia)
  • Ludwig series 2 casting announced September 2025 (Wikipedia)
4What’s next
  • Ludwig series 2 (BBC) — joining as Gareth Fisher (Wikipedia)
  • Netflix limited series Dept. Q — Lord Advocate Stephen Burns (Wikipedia)

Mark Bonnar’s key biographical data and notable television appearances are summarized in the table below.

Field Value
Full Name Mark Bonnar
Date of Birth 19 November 1968
Place of Birth Edinburgh, Scotland, UK
Notable TV Roles Max (Guilt), Duncan Hunter (Shetland), Mike Dryden (Line of Duty)
Shetland Start Year 2013
Netflix Role Stephen Burns in Dept. Q (2025)
BBC Role Gareth Fisher in Ludwig series 2
Career Span 2001–present

What is Mark Bonnar famous for?

Mark Bonnar is a Scottish actor who has become a familiar face on British television, particularly in crime and drama series. His career spans over two decades, with appearances across BBC, ITV, Channel 4, and more recently streaming platforms like Netflix and Amazon.

He first appeared on screen in the series Rebus in 2001, and his career has since included recurring roles in several acclaimed British dramas. According to Wikipedia, Bonnar is “known for his roles as Max in Guilt, Duncan Hunter in Shetland, and DCC Mike Dryden in Line of Duty” — a trio of performances that have defined his television profile.

His work tends toward characters with authority and composure: detectives, officials, and professionals who bring a calm steadiness to tense situations. Rotten Tomatoes notes that Bonnar “would become even more well known after taking on the role of Duncan Hunter on the crime drama Shetland (BBC, 2013–)” Rotten Tomatoes.

Key roles in TV dramas

  • Max — Lead role in the BBC/BBC Scotland psychological thriller Guilt (2019)
  • Duncan Hunter — Regular detective character in Shetland (BBC Scotland, from 2013)
  • DCC Mike Dryden — Deputy Chief Constable in Line of Duty (BBC, multiple seasons)

The implication: Bonnar’s fame rests on a specific type of role — authoritative figures in procedural dramas — rather than the broader versatility he has shown across other genres.

What is Mark Bonnar’s most famous TV show?

No single show definitively stands above the rest in Bonnar’s career. However, three titles consistently surface in discussions of his work:

  • Guilt — The psychological thriller gave Bonnar his most prominent lead role
  • Shetland — The longest-running regular commitment, spanning from 2013 to the present
  • Line of Duty — One of the BBC’s most acclaimed crime series, reaching millions of viewers

What this means: Shetland gives him the longest tenure, Guilt gives him the central narrative focus, and Line of Duty gives him the prestige association. Depending on which metric you prioritize, a different show emerges as “most famous.”

The upshot

For viewers deciding where to start, Shetland offers the most sustained immersion in Bonnar’s character work — and it’s still ongoing.

Who did Mark Bonnar play in Line of Duty?

Mark Bonnar portrayed DCC (Deputy Chief Constable) Mike Dryden in Line of Duty. The character appeared across multiple seasons of the BBC crime drama, which became known for its intricate anti-corruption narratives and high-stakes police investigations.

According to multiple sources including Wikipedia, Dryden was one of several senior officers whose conduct came under scrutiny during the series. Bonnar’s portrayal brought a measured authority to the role — a character who operated in the upper echelons of Central Police Command Wikipedia.

The catch: DCC Dryden’s arc in Line of Duty was a supporting one rather than a central narrative thread. Viewers looking for Bonnar’s most substantial role in the series may find Shetland more representative of his screen time and character depth.

Mike Dryden role

  • Rank: Deputy Chief Constable (DCC)
  • Series: Line of Duty (BBC)
  • Character type: Senior police officer with oversight responsibilities
  • Arc: Part of the series’ examination of institutional corruption

What else has Mark Bonnar been in?

Beyond his high-profile crime drama roles, Mark Bonnar has accumulated a wide-ranging filmography across British television. What’s On Stage lists credits including Inside No. 9, Defending the Guilty, Apple Tree Yard, Catastrophe, Humans, and The Rig on Amazon WhatsOnStage.

Earlier in his career, he played Bruno Jenkins in the long-running BBC medical drama Casualty from 2004 to 2005. He also appeared in the Doctor Who universe, though sources differ on the specific episode or role TV Guide.

Notable additional credits

He played Chris in Catastrophe (Channel 4, from 2015), portrayed Dr Neil Sommer in Humans (Channel 4/AMC, 2018), and co-starred as Colin Osborne in Unforgotten (ITV, starting 2017) WhatsOnStage.

The pattern: Bonnar’s career shows a consistent presence on UK broadcast television (BBC, ITV, Channel 4) with recent expansion into streaming originals. TV Guide confirms he has focused primarily on British productions, with no major US television roles listed TV Guide.

Shetland

Mark Bonnar has played Duncan Hunter in Shetland since the series began in 2013. According to Shetland Fandom, the character is a detective working within the island community, and Bonnar has returned as a regular across multiple seasons Shetland Fandom. Rotten Tomatoes confirms the series began in 2013 with Bonnar in the role Rotten Tomatoes.

Doctor Who

Sources indicate Bonnar appeared in the Doctor Who universe, though the specific episode and character name are reported inconsistently across reference sites. Wikipedia lists Doctor Who among his other TV credits, while TVMaze provides episode tracking for various series but without a specific Doctor Who entry TVMaze.

Unforgotten

Bonnar appeared in Unforgotten beginning in 2017, playing the character Colin Osborne. Shetland Fandom lists this role alongside his other detective-style work, noting the character appeared in the first season Shetland Fandom.

Department Q

Mark Bonnar starred as Lord Advocate Stephen Burns in Department Q, a Netflix limited series released in 2025. Wikipedia confirms this as one of his most recent major television commitments Wikipedia. Rotten Tomatoes tracks this as part of Bonnar’s career progression into international streaming productions Rotten Tomatoes.

What is Mark Bonnar’s real accent?

Mark Bonnar was born and raised in Edinburgh, Scotland. His natural accent is Scottish, specifically from the Edinburgh area. He attended Leith Academy in the city, according to information from fan wikis Shetland Fandom.

Why this matters: On screen, Bonnar often adopts a range of accents depending on character requirements. In roles like DCC Mike Dryden in Line of Duty, he used an accent consistent with a senior police officer in Central Scotland. His performances in Shetland similarly required adjustment for the island setting.

Scottish origins

Bonnar’s Scottish background aligns him with a significant tradition of Scottish actors working in UK television. His Edinburgh upbringing places him in the capital city rather than the Highlands or islands, which may influence certain dialect characteristics.

The trade-off: While Bonnar’s natural speech is Scottish, his professional versatility means viewers may encounter him in various regional or neutral British accents across his roles.

Bottom line: Mark Bonnar is a seasoned Scottish character actor best known for authoritative roles in British crime dramas. Viewers who enjoy Shetland or Line of Duty will find his work in those series most representative of his screen presence. Those new to his career can start with Guilt for a lead performance, or Shetland for the longest sustained character work.

“He is known for his roles as Max in Guilt, Duncan Hunter in Shetland, … DCC Mike Dryden in Line of Duty”

— Wikipedia Editors, Encyclopedic summary

“Bonnar would become even more well known after taking on the role of Duncan Hunter on the crime drama Shetland (BBC, 2013-)”

— Rotten Tomatoes, Film/TV database

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Mark Bonnar’s intense portrayal of DS Mike Dryden in Line of Duty reached new heights during Line of Duty Series 3, unraveling layers of police corruption and moral dilemmas.

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Frequently asked questions

What TV shows has Mark Bonnar starred in?

Mark Bonnar has appeared in numerous British series including Line of Duty, Shetland, Guilt, Unforgotten, Humans, Catastrophe, Inside No. 9, Defending the Guilty, Apple Tree Yard, and most recently Dept. Q (Netflix, 2025) and Ludwig series 2 (BBC).

What role did Mark Bonnar play in Shetland?

He played Duncan Hunter, a detective character who has been a regular in the series since it began in 2013.

Has Mark Bonnar appeared in Doctor Who?

Sources indicate he appeared in the Doctor Who universe, though specific episode details vary across reference sites.

What role did Mark Bonnar play in Guilt?

He played Max, the lead character in the psychological thriller Guilt (BBC/BBC Scotland, 2019).

What role did Mark Bonnar play in Unforgotten?

He played Colin Osborne, appearing in Season 1 of the ITV cold case drama starting in 2017.

Is Mark Bonnar in Department Q?

Yes. He starred as Lord Advocate Stephen Burns in the Netflix limited series Department Q, released in 2025.

What other credits does Mark Bonnar have?

Other notable appearances include Casualty (2004–2005), Paradox (2009–2010), Doctor Who, Taggart, Vera, Grantchester, Case Histories, The Paradise, Phoneshop, New Blood, Home Fires, Undercover, and The Rig (Amazon).