Main
Joe Cole as Sean Wallace (series 1–3), the younger son of Finn and Marian Wallace, who fights for leadership of his family's criminal empire after his father's death.
Thomas Simpson portrays Sean as a teenager during flashbacks.
Colm Meaney as Finn Wallace (series 1), the late patriarch of the Wallace family and leader of a criminal empire whose murder throws the London underworld into chaos.
Lucian Msamati as Edward "Ed" Dumani (series 1–3), the patriarch of the Dumani family and Finn's longtime right-hand man.
Jevan Onasanya portrays Ed as a teenager during flashbacks.
Sope Dirisu as Elliot Carter, an undercover police officer who infiltrates the Wallace Organisation and begins a relationship with Shannon Dumani. Introduced as "Elliot Finch", in the first-season finale, Elliot's real surname is revealed to be "Carter", with the character based on The Getaway video game character Frank Carter, by which surname he is known for the rest of the series.
Ejiro Ndi-Efam portrays Elliot as a child during flashbacks.
Michelle Fairley as Marian Wallace, the ruthless matriarch of the Wallace family.
Brian Vernel as Billy Wallace, the older son of Finn and Marian who suffers from substance abuse.
Pete MacHale portrays Billy as a teenager during flashbacks.
Valene Kane as Jacqueline Robinson (series 1–2, 4), the daughter of Finn and Marian and a doctor who is estranged from her family for the safety of her unborn child.
Paapa Essiedu as Alexander "Alex" Dumani (series 1–2), the son of Ed Dumani and a close associate of Sean, who many in the Wallace Organisation believe should inherit Finn's criminal empire.
Pippa Bennett-Warner as Shannon Dumani, the daughter of Ed Dumani, who begins a relationship with Elliot.
Asif Raza Mir as Asif Afridi (series 1–3), the influential kingpin of the Pakistani drug cartel.
Orli Shuka as Luan Dushaj, the leader of the Albanian mafia in London, who is brought into the Wallace family's disputes when Finn Wallace is murdered on his territory.
Narges Rashidi as Lale, the leader of the Kurdish PKK in London who oversees a heroin distribution ring whilst seeking revenge against Asif.
Mark Lewis Jones as Kinney Edwards (series 1), the leader of a group of Welsh travellers who become involved in the murder of Finn Wallace.
Ray Panthaki as Jevan Kapadia (series 1), the point of contact for the mysterious Investors who wish to tip the scales of the future of London's criminal underworld.
Jing Lusi as Victoria "Vicky" Chung (series 1), a detective inspector in the London Metropolitan Police and Elliot's handler.
Waleed Zuaiter as Koba (series 2), the ruthless leader of the Georgian mafia and an international arms dealer who is brought to London by the Investors to bring order to the city.
Jahz Armando as Saba Soudani (series 2–3), Basem's niece who works at a cafe that acts as a front for the Algerian mafia.
Fady Elsayed as Faz Soudani (series 2–3), Basem's younger nephew and a member of the Algerian mafia who becomes traumatised after a run-in with Koba.
Salem Kali as Basem Soudani (series 2), the leader of the Algerian mafia in London who wants to free his gang from the Investors' control.
Aymen Hamdouchi as Hakim Soudani (series 2), Basem's older nephew and right-hand man in the Algerian mafia.
Andrew Koji as Zeek Kimura (series 3–present), a mysterious and highly skilled assassin who is secretly Finn's illegitimate son.
Richard Dormer as Cornelius Quinn (series 3), Marian's brother and the leader of an Irish gang.
T'Nia Miller as Simone Thearle (series 3–present), the mayor of London who targets organised crime in the city by starting a war on drugs.
Tamara Lawrance as Jo Malik (series 4)
Luna Fujimoto as Hanaka (series 4)
Eugene Nomura as Takeshi Kimura (series 4)
Melika Foroutan as Zerin (series 4)
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