Abu Hamza was convicted of 11 terror and kidnapping charges, including a charge that he helped kidnappers in Yemen in a 1998 attack that killed four people.
During the trial, he was accused of turning London's Finsbury Park mosque into an operations centre for the global export of violence and terror.
The Egyptian-born cleric was also found guilty of arranging for fighters to attend an Afghanistan al Qaida training camp.
Prosecutors said the defendant also financed and sent two men to Bly in Oregon to set up a compound to train others in terrorism.
Abu Hamza could face life imprisonment after being found guilty of all charges in his New York trial.
A jury of eight men and four women found the cleric, 56, guilty on all 11 counts he faced, handing Manhattan U.S. Attorney Preet Bharara his second high-profile terrorism conviction in three months.
The imam was extradited from the UK in 2012 after a series of court battles with the British government.
Islamist cleric Abu Hamza has been found guilty of all terror charges in his US trial.
Abu Hamza's US terror trial today heard that the Muslim preacher formerly worked for MI5 and co-managed a strip club in London's Soho.
Hamza's lawyer produced documents apparently from Scotland Yard that he said showed the radical cleric worked as an intermediary for the UK spy agency and had helped police defuse tensions with the Muslim community in Britain.
Hamza also told the New York court he had run a strip club in central London's party district after coming to the capital in the 1980s to "make money and enjoy myself", adding that some of the employment he gained was "on the wrong side of morality".
Hamza was extradited from the UK to America two years ago to face a string of terrorism charges, which he denies.
Islamist cleric Abu Hamza denied supporting terrorism as he gave evidence at his US trial.
Hamza, who is on trial under the name Mustafa Kamel Mustafa, told a federal court in New York that he would give up freedom if the price was his dignity and beliefs.
The 56-year-old cleric, was extradited from Britain to the US two years ago, countered three weeks of government evidence with answers to rapid-fire questions posed by defence lawyer Joshua Dratel.
"No," Mustafa calmly replied repeatedly as Mr Dratel asked him if he participated in a December 1998 kidnapping in Yemen, tried to organise a terrorist training camp in the US of Oregon, aided al Qaida or sent anyone to Afghanistan to engage in terror training.
In a court in New York, the radical Islamic cleric, Abu Hamza has been accused of using his religion to hide his recruitment of terrorists in Britain.
Mr Hamza was extradited from the UK to America two years ago to face a string of terrorism charges.
The prosecutor in the US trial against Islamic preacher Abu Hamza told jurors that he was part of a global campaign to spread terror.
Federal prosecutor Edward Kim described Mr Hamza as a man with a mission to establish an al-Qaida training camp in the US, and said the defendant financed and sent two men to Bly in Oregon to set up the compound to train others.
Abu Hamza had been jailed since 2004 in Britain on separate charges. He was extradited to the US in 2012 only after the US agreed he would face a civilian trial not a military one, and that the death penalty was off the table.
The US government has said Islamic preacher Abu Hamza tried to create an al-Qaida terrorist training camp in Oregon in late 1999 and early 2000, during opening arguments at his trial in New York.
Mr Hamza is also charged with helping kidnappers in Yemen in a 1998 attack that killed four people, and of arranging for fighters to attend an Afghanistan al Qaida training camp.
But the defence lawyer for Abu Hamza - who is also known by the aliases Mustafa Kamel Mustafa and Abu Hamza al-Masri - said he has never harmed Americans.
Abu Hamza, the one-eyed Muslim cleric with a hook for a hand, goes on trial in New York on charges that he provided support for al Qaeda in Afghanistan.
Hamza faces 11 terrorism related counts, some of these include:
- Trying to start a terrorist training camp in Oregon in 1999
- Charges that he aided militants who kidnapped a group of tourists in Yemen in 1998
- Gathering funds from UK venues for the Taliban and to support training for jihad in Afghanistan.
The Egyptian-born preacher, who faces life in prison if convicted, told a judge at a pretrial hearing on Wednesday that he is innocent.
The decision on whether a suspected ally of hate preacher Abu Hamza should be kicked out of Britain will be made by human rights judges today.
Currently being held at high-security psychiatric hospital Broadmoor, Haroon Aswat, is wanted by US prosecutors for allegedly plotting with Hamza to set up a terror-training camp in Bly, Oregon.
Aswat's case was adjourned to allow judges more time to consider his mental health as he is currently being treated for schizophrenia.