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That meant 2.5% of the employed UK workforce was on such a contract.
The 801,000 figure is the highest since the ONS began monitoring the number of zero-hours contracts.
ONS statistician Nick Palmer said some of the rise could reflect greater recognition of "zero-hours" contracts.
However, he added: "There's also nothing to suggest this form of employment is in decline."
In its report, the ONS said there were about 1.7 million contracts that did not guarantee a minimum number of hours in November, meaning that many workers had more than one zero-hours contract.
The previous estimate, for May 2015, was 2.1 million, but the ONS said that the estimates could be affected by seasonal factors and should not be directly compared.
The ONS data on zero-hours contracts is not as clear as it could be. As the ONS points out, "at least some of this increase may be due to greater public recognition of the term 'zero-hours contract'". That means that many people do not know that they are on a zero-hours contract, or what the term means.
Therefore much of this increase may be down to media coverage - or even the fact that the statisticians are explaining the term to people when they gather the data. The ONS itself does not know how much of this increase is down to an increasing use of these contracts and how much is down to such factors.
What we do know is that the proportion of businesses using such contracts varies considerably. In the hotel and catering industries more than a quarter of employers use them, but in the construction sector only one in 20 companies do so. These figures may also be affected by seasonal factors, given that many industries employ more people in the summer.
However, the ONS says that "there's also nothing to suggest this form of employment is in decline". That means the controversy is unlikely to decline either.
Those on zero-hours contracts were more likely to be young people, part-time workers, women, or those in full-time education when compared with other people in employment.
Someone on a zero-hours contract worked an average of 26 hours a week. About a third of those on a zero-hours contract wanted to work longer, with most wanting more hours in their current job, as opposed to a different job that offered more hours.
In comparison, only 10% of other people in other types of employment wanted more hours, the ONS said.
TUC general secretary Frances O'Grady said zero-hours contracts could be "a nightmare for workers".
"The so-called flexibility these contracts offer is far too one-sided," she said. "Staff without guaranteed pay have much less power to stand up for their rights and often feel afraid to turn down shifts in case they fall out of favour with their boss."
TUC research found that average weekly earnings for zero-hours workers were Â£188, compared with Â£479 for permanent employees.
Laura Gardiner, of the Resolution Foundation, said some workers on zero-hours contracts struggled to cope with fluctuating pay levels, which made it hard to budget.
"While zero-hours contracts still make up a comparatively small, albeit growing, part of the labour market, it is still crucial that policy makers consider the effect of unstable employment on both workers and the economy," she said.
Owen Smith, shadow work and pensions secretary, said the Conservatives had failed to take action on zero-hours contracts as promised before the last general election.
A Department for Business spokesperson said zero-hours contracts "had a part to play in a modern, flexible labour market", adding: "We have acted to ban the use of exclusivity clauses in these contracts which prevent people from boosting their income when they have no guarantee of work."
The number of workers on a zero-hours contract for their main job stood at 801,000 in late 2015, up by 104,000 from a year earlier, the Office for National Statistics (ONS) has said.

Chris Hughton's side had avoided defeat in their opening 21 league games.
Kike's first goal since 18 August, a near-post header from Albert Adomah's fourth-minute cross, put Boro in front.
Adomah diverted in Daniel Ayala's header to make it 2-0 at half-time and Cristhian Stuani nodded in from close range after the break to seal victory.
Leaders Middlesbrough are three points clear of Brighton, who surrendered second place in the table as Derby won at Ipswich.
The home side's failure to deal with crosses proved to be their undoing, with all three of Middlesbrough's goals coming from centres into the box.
Brighton struggled to break through a resolute Boro defence, which kept their 12th clean sheet in 22 league outings this term and has not conceded a goal in any of their last six Championship matches.
Brighton 0-3 Middlesbrough as it happened
Former West Bromwich Albion striker Jason Roberts on BBC Radio 5 live: "Brighton could have been a bit more decisive. Make no mistake, they've come up against a really strong, well-oiled unit.
"(Middlesbrough head coach) Aitor Karanka hasn't shouted and screamed, he's been calm throughout and you can be when you've got a team that's only conceded 12 goals in the league.
"When you're coming up a side like that and you concede goals the way they have, it's very disappointing.
"Chris Hughton will be disappointed with the way they've gone about this game, but they need to maintain their focus because this is a team that could come very close to promotion."
News of Guus Hiddink's appointment as Chelsea manager broke during Middlesbrough's victory at Brighton, which was watched by his predecessor at Stamford Bridge - Jose Mourinho.
An agency representing the 52-year-old released a statement earlier on Saturday, which read: "He (Jose) will not be attending any high-profile games because he wants to discourage any speculation about his future."
But Mourinho did take in some Championship action later in the day and he watched Karanka - who was on Mourinho's coaching staff at Real Madrid - lead his side to an emphatic success.
Brighton manager Chris Hughton:
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"Middlesbrough got an early goal and an early lift. We've now conceded four goals from corners in our last three games and that is something that needs to be eradicated.
"But we were up against a very good side and it's very difficult to be too harsh on the players.
"The reaction from our supporters at the end was excellent, and I hope the impact is positive and this defeat is a little bit of a reality check that allows us to get back to winning ways."
Middlesbrough head coach Aitor Karanka:
"Jose brought us luck. We worked together at Real Madrid and it was an amazing experience.
"He is a friend of mine. I didn't tell the players that he would be watching but it wasn't a secret.
"Afterwards, he came into the dressing room to offer congratulations. He felt he had watched a really good team and he was impressed with us. He was the best and he will be the best."
Match ends, Brighton and Hove Albion 0, Middlesbrough 3.
Second Half ends, Brighton and Hove Albion 0, Middlesbrough 3.
Attempt saved. Cristhian Stuani (Middlesbrough) right footed shot from outside the box is saved in the top right corner. Assisted by George Friend.
Offside, Middlesbrough. George Friend tries a through ball, but Albert Adomah is caught offside.
Attempt blocked. Dale Stephens (Brighton and Hove Albion) right footed shot from outside the box is blocked. Assisted by Bruno.
Attempt blocked. Íñigo Calderón (Brighton and Hove Albion) right footed shot from outside the box is blocked. Assisted by Dale Stephens.
Offside, Middlesbrough. Stewart Downing tries a through ball, but Diego Fabbrini is caught offside.
Foul by Bruno (Brighton and Hove Albion).
Diego Fabbrini (Middlesbrough) wins a free kick in the defensive half.
Foul by Íñigo Calderón (Brighton and Hove Albion).
Diego Fabbrini (Middlesbrough) wins a free kick on the right wing.
Substitution, Middlesbrough. Bruno Zuculini replaces Adam Clayton.
Foul by Bobby Zamora (Brighton and Hove Albion).
Tomas Kalas (Middlesbrough) wins a free kick in the defensive half.
Rajiv van La Parra (Brighton and Hove Albion) wins a free kick on the right wing.
Foul by Albert Adomah (Middlesbrough).
Attempt blocked. Bobby Zamora (Brighton and Hove Albion) header from the centre of the box is blocked. Assisted by Bruno with a cross.
Substitution, Brighton and Hove Albion. Andrew Crofts replaces Jamie Murphy.
Substitution, Brighton and Hove Albion. Bobby Zamora replaces Tomer Hemed.
Substitution, Middlesbrough. Tomas Kalas replaces Nsue.
Beram Kayal (Brighton and Hove Albion) wins a free kick on the left wing.
Foul by Adam Clayton (Middlesbrough).
Foul by Beram Kayal (Brighton and Hove Albion).
Diego Fabbrini (Middlesbrough) wins a free kick in the attacking half.
Attempt missed. James Wilson (Brighton and Hove Albion) header from the centre of the box misses to the left. Assisted by Jamie Murphy with a cross.
Substitution, Middlesbrough. Diego Fabbrini replaces Kike.
Corner,  Brighton and Hove Albion. Conceded by Ben Gibson.
Goal!  Brighton and Hove Albion 0, Middlesbrough 3. Cristhian Stuani (Middlesbrough) header from the left side of the six yard box to the high centre of the goal. Assisted by Kike following a corner.
Attempt missed. Kike (Middlesbrough) left footed shot from the right side of the box misses to the left. Assisted by George Friend following a corner.
Corner,  Middlesbrough. Conceded by David Stockdale.
Attempt missed. Adam Clayton (Middlesbrough) right footed shot from outside the box is close, but misses to the left following a corner.
Substitution, Brighton and Hove Albion. Connor Goldson replaces Uwe Hünemeier because of an injury.
Delay over. They are ready to continue.
Delay in match Uwe Hünemeier (Brighton and Hove Albion) because of an injury.
Corner,  Middlesbrough. Conceded by Uwe Hünemeier.
Attempt missed. Nsue (Middlesbrough) right footed shot from long range on the right is just a bit too high.
Attempt blocked. Tomer Hemed (Brighton and Hove Albion) right footed shot from the centre of the box is blocked. Assisted by Rajiv van La Parra with a cross.
Corner,  Brighton and Hove Albion. Conceded by Dimitrios Konstantopoulos.
Attempt saved. Jamie Murphy (Brighton and Hove Albion) right footed shot from the left side of the box is saved in the centre of the goal. Assisted by Íñigo Calderón.
Attempt blocked. James Wilson (Brighton and Hove Albion) left footed shot from outside the box is blocked. Assisted by Beram Kayal.
Middlesbrough confirmed they will be top of the Championship at Christmas by winning at Brighton and ending the Seagulls' unbeaten start to the season.

Laura Pulley, from Canvey Island in Essex, was told she could not travel when she tried to pay 25p in coppers.
Bus company First wrote to her to say the driver realised "the situation could have been handled better".
"I hope he thinks twice next time in handling the situation differently," said Ms Pulley, 35.
"I've had a letter from First bus company saying they had confirmed the operations team had spoken to the bus driver and they genuinely apologised for the incident.
"The driver has confirmed that after reflection the situation could have been handled better and he would like the opportunity to apologise personally to me.
"I accept the apology in the letter but I am still unsure whether I shall let him apologise to me personally.
"I'm pleased to have the letter. There had been a couple of nasty comments suggesting I had been aggressive and abusive.
"This is for my own peace of mind - I know I wasn't rude. To have him accept responsibility and apologise makes me happy."
Ms Pulley was refused travel when trying to make a short journey on Canvey Island on Monday.
After the driver called police, an officer spoke to him and then offered Ms Pulley some spare change.
"I couldn't believe the audacity of the driver to tell me I couldn't travel," Ms Pulley said.
The Coinage Act 1971 says 1p and 2p coins are legal tender for any amount not exceeding 20p.
But "both parties are free to agree to accept any form of payment whether legal tender or otherwise according to their wishes", the Royal Mint says.

A bus driver who called police when a passenger tried to pay part of her fare in 1p and 2p coins has said he wants to meet her in person to apologise.

