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A police investigation has been launched into the death of the 67-year-old - a wanted man in Russia, and an opponent of President Vladimir Putin.
A former Kremlin power-broker whose fortunes declined under Mr Putin, Mr Berezovsky emigrated to the UK in 2000.
Thames Valley Police said the death, at a property in Ascot, Berkshire, was being treated as unexplained.
The area around the property has been cordoned off to allow the investigation to take place, the force said.
The inquiry was at a very early stage and more details will be released when available, it added.
A South Central Ambulance Service spokeswoman said it had been called to the property at 15:18 GMT.
"We sent a number of ambulance officers and an ambulance to the address. The 67-year-old male was confirmed deceased at the scene," she said.
Last year, Mr Berezovsky lost a Â£3bn ($4.7bn) damages claim against Chelsea Football Club owner Roman Abramovich.
Mr Berezovsky claimed he had been intimidated by Mr Abramovich into selling shares in Russian oil giant Sibneft for a "fraction of their true worth".
The allegations were completely rejected by the London Commercial Court judge, who called Mr Berezovsky an "inherently unreliable" witness.
By Steve RosenbergMoscow correspondent, BBC News
Russians have little sympathy for oligarchs, whether alive or dead.
That's because while Boris Berezovsky - and the tiny number of other tycoons - were striking rich in the 1990s, millions of people here were sliding into poverty.
As he gained in power, many Russians saw Berezovsky as the "grey cardinal" in the Kremlin - exerting huge political influence for his own benefit.
Having fled to London, he became a vocal Kremlin critic and pledged to work from self-imposed exile to depose President Putin. But back home in Russia,  many of Mr Putin's opponents blamed Berezovsky for having engineered the transfer of power from Yeltsin to Putin.
Boris Berezovsky will be remembered as a towering figure of the 1990s and as one of the most powerful men in Yeltsin's Russia.
BBC world affairs reporter Richard Galpin said sources have told him that Mr Berezovsky was depressed after the loss of the court case and was under financial pressure.
The tycoon's wealth is thought to have considerably diminished in recent years, leaving him struggling to pay debts in the wake of costly court cases.
Mr Berezovsky had made his fortune in the 1990s selling imported Mercedes as well as Russian-made cars.
He was one of the first Russian oligarchs - a tiny group of tycoons who at the end of communism used their connections to become rich almost overnight.
Later owning Sibneft, the national airline Aeroflot, and as primary shareholder in Russia's main television channel, he supported Boris Yeltsin's rise to power, enjoying huge influence during this era.
Mr Berezovsky survived numerous assassination attempts, including a bomb that decapitated his chauffeur.
During the later years of Yeltsin's presidency, Mr Berezovsky was part of the leader's inner circle as deputy secretary of Russia's security council.
"Boris Berezovsky was one of the most powerful men in Russia back in the 1990s," said the BBC's Moscow correspondent, Steve Rosenberg.
"He rose from being a mathematician, a computer programmer and a used car salesman, to being such an influential figure in Boris Yeltsin's Russia."
He then played a role in Mr Putin's rise in the late-1990s, before the new president moved to curb the political ambitions of Russia's oligarchs.
Leaving Russia for self-imposed exile in the UK, Mr Berezovsky became one of Mr Putin's fiercest critics.
But our correspondent said that on Saturday, a spokesman for Mr Putin said that Mr Berezovsky had sought the president's permission to return to Russia.
Exiled Russian tycoon Boris Berezovsky has been found dead at his home outside London.

Trucks and cars began crossing the border into North Korea at exactly 08:00 (23:00 GMT Sunday).
More than 800 South Koreans were due to cross to the jointly-run centre for what is being called a trial restart.
The zone, just inside North Korea, is home to 123 South Korean factories that employ more than 50,000 North Koreans.
It is the last functioning inter-Korean joint project and a key source of revenue for Pyongyang.
By Lucy WilliamsonBBC News, Seoul
The last time trucks queued up at the Kaesong crossing point, five months ago, the border with North Korea remained resolutely closed.  This time, shortly after 08:00, the long line of vehicles began moving through, on their way to the newly-reopened industrial complex.
More than 800 South Koreans were due to cross over into Kaesong on Monday, to restart operations at around half the factories there.
The resurrection of the complex is the result of weeks of tough negotiations between the two sides, and those discussions are still not finalised.  Among those heading across the border today were a team of negotiators, tasked with hammering out the details for how the complex would look in future.
High on their agenda is the subject of internet and mobile phone access for the site - contentious issues for the North, but key if foreign investors are to be wooed to the complex as a stabilising influence.
After a five-month suspension of the complex, attracting foreign companies has perhaps become a little harder.  And even South Korea remains wary, calling Monday's operation a "trial run", not a formal and permanent re-opening of Kaesong.
But Kaesong remains, to many here, the "canary in the mine" of inter-Korean relations, and the agreement to resume operations there paved the way for further signs of a thaw between the two Koreas: the restoration of a military hotline, and a planned reunion of families separated by the Korean War.
Its commercial image may be tarnished, but Kaesong's importance as a political symbol here remains.
But the North withdrew all of its workers in April, as ties between the two Koreas deteriorated in the wake of Pyongyang's 12 February nuclear test.
Reopening the complex has taken months of negotiation.
South Korea's Unification Ministry said a total of 820 managers and workers planned to cross into the complex on Monday, with 400 to stay there overnight.
They will be inspecting production facilities to assess how quickly a full restart can be implemented after  five months of inactivity.
The restart is being described as a trial but more than half of the South Korean companies had asked North Korean employees to report for work, the ministry said.
Negotiations on resuming operations at the complex faltered for weeks on South Korea's insistence that safeguards must be in place to prevent any future unilateral shut-down of the site by North Korea.
But the two sides have now set up a joint management committee to run operations at Kaesong, which last week set a restart date for the complex.
The committee has also reached agreement on smoother access to the site for South Koreans by expanding permitted border crossing times and is negotiating about improving communications there.
The Koreas have also agreed to open the site to foreign investors - a move seen as making it harder for North Korea to unilaterally close the complex again.
South Korean firms will be exempt from taxes for the rest of the year, to offset losses incurred while the complex was closed.
But some local businessmen remain worried about the risks of doing business with Pyongyang.
Q&A: Kaesong Industrial Complex
"Honestly, I still feel a bit nervous, because you never know whether the North will change its mind in the future," a textile company manager told the French news agency AFP. "Who knows if a crisis like this won't happen again?" he said.
The shutdown was the first for the Kaesong complex since it was opened more than a decade ago.
It came during a period of very high tension on the Korean peninsula.
The 12 February nuclear test led to expanded UN sanctions which, along with an annual US-South Korean joint military drill, angered Pyongyang.
It threatened attacks on multiple targets in the region, prompting warnings - and displays of high-tech military hardware - from the US.
Tensions have eased somewhat in recent weeks, however.
The two Koreas have also recently agreed to hold the first reunion of families separated by the division of the peninsula after the 1950-53 Korean War later this month. It will be the first such reunion in 10 years.
South Korean workers have returned to the Kaesong industrial park in North Korea, five months after work was halted amid high political tension.

The fourth-placed Fifers were beaten 3-0 by Alloa as the Spiders dropped to sixth after losing 3-1 away to Brechin City, who moved up to fifth.
Livi do, however, have two games in hand over the Wasps.
Third-placed Airdrieonians, as well as East Fife, Brechin and Queen's Park, each have one game in hand.
Greig Spence's header and Kevin Cawley's strike put Alloa in command against the Fifers before Jamie Longworth nodded the hosts' third.
Queen's Park went ahead early on against Brechin through Bryan Wharton's free-kick, but Ally Love quickly levelled - also from a set play.
Dougie Hill headed City in front before the break and Andy Jackson struck their third in stoppage time.

Alloa Athletic moved to within six points of Scottish League One leaders Livingston as East Fife and Queen's Park's promotion hopes stuttered.

