- Mikael Blomkvist – journalist, publisher and part-owner of the monthly political magazine, Millennium
- Lisbeth Salander – freelance surveillance agent and researcher specializing in investigating people on behalf of Milton Security
- Erika Berger – editor-in-chief/majority owner of Millennium and Blomkvist's long-standing lover
- Henrik Vanger – retired industrialist and former CEO of Vanger Corporation
- Harriet Vanger – Henrik's grandniece who disappeared without trace in 1966
- Martin Vanger – Harriet's brother and CEO of Vanger Corporation
- Gottfried Vanger – Henrik's nephew, and Martin and Harriet's deceased father
- Isabella Vanger – Gottfried Vanger's widow, and Martin and Harriet's mother
- Cecilia Vanger – daughter of Harald Vanger and one of Henrik's nieces
- Anita Vanger – daughter of Harald Vanger and one of Henrik's nieces, currently living in London
- Birger Vanger – Harald Vanger' son; one of Henrik's nephews
- Harald Vanger – Henrik's elder brother, a member of the Swedish Nazi Party
- Hans-Erik Wennerström – corrupt billionaire financier
- Robert Lindberg – a banker, Blomkvist's source for the libelous story on Wennerström
- William Borg – a former journalist and Blomkvist's nemesis
- Monica Abrahamsson – Blomkvist's ex-wife whom he married in 1986 and divorced in 1991
- Pernilla Abrahamsson – their daughter who was born in 1986
- Greger Beckman – Erika Berger's husband
- Holger Palmgren – Salander's legal guardian and lawyer who becomes disabled by a stroke
- Nils Bjurman – Salander's legal guardian and lawyer after Palmgren
- Dirch Frode – former lawyer for Vanger Corporation, now a lawyer with only one client: Henrik Vanger
- Dragan Armanskij – CEO and COO of Milton Security, Lisbeth's employer
- Plague – computer hacker/genius
- Eva – Martin Vanger's girlfriend
- Christer Malm – director, art designer and part-owner of Millennium
- Janne Dahlman – managing editor of Millennium
- Gustaf Morell – retired Detective Superintendent who investigated Harriet's disappearance
- Anna Nygren – Henrik Vanger's housekeeper
- Gunnar Nilsson – caretaker of Henrik Vanger's domain in Hedeby
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