Ms Badenoch has served as shadow business and trade secretary since the Conservative Party lost the general election in July and Rishi Sunak said he would stand down as leader, triggering the campaign.
Her campaign was called Renewal 2030 and has targeted the next election for the Tories to return to power.
Ms Badenoch has been criticised at times for her outspoken approach, with opponents jumping on comments she has made about subjects such as maternity pay, gender equality and net zero.
But she has long been popular among the party membership, and previously ran to be leader in 2022.
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3:17
Badenoch crowned Tory leader
However, James Cleverly revealed the day before the results that he would be returning to the backbenches.
Speaking after her win, Ms Badenoch thanked the other candidates, saying the party had come through the campaign “more united”.
The new leader went on to say the party’s first duty as opposition was to hold Labour to account – and also to prepare for government by the time of the next election.
She then went on to criticise previous Conservative administrations.
Ms Badenoch said: “Our party is critical to the success of our country.
“But to be heard, we have to be honest, honest about the fact that we made mistakes, honest about the fact that we let standards slip.
“The time has come to tell the truth, to stand up for our principles, to plan for our future, to reset our politics and our thinking, and to give our party and our country the new start that they deserve.
“It is time to get down to business. It is time to renew.”
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1:25
Badenoch: ‘We let standards slip’
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In total, around 132,000 members of the Conservative Party were eligible to vote in the leadership election – a noticeable fall from the 172,000 in the contest in 2022 which Liz Truss won.
The turnout was also down – 72.8% in 2024 vs 82.2% in 2022 – with around 40,000 members not voting.
Prime Minister Sir Keir Starmer said: “Congratulations, Kemi Badenoch, on becoming the Conservative Party’s new leader.
“The first black leader of a Westminster party is a proud moment for our country.
“I look forward to working with you and your party in the interests of the British people.”
Ellie Reeves, who is chair of the Labour Party, delivered a more political attack: “It’s been a summer of yet more Conservative chaos and division.
“They could have spent the past four months listening to the public, taking responsibility for the mess they made and changing their party.
“Instead, Kemi Badenoch’s election as leader shows they’re incapable of change.
“Meanwhile, the Labour Government is getting on with fixing the foundations of our economy and cleaning up the mess the Tories left behind.”
Image: Mr Jenrick congratulate Ms Badenoch on her win. Pic: PA
Liberal Democrat leader Sir Ed Davey congratulated Ms Badenoch as well for her election – before adding that the Tories are still “too divided, out-of-touch and unable to accept Conservative failures over the past years”.
Richard Tice, the leader of the Conservative Party, did not congratulate her and instead attacked Ms Badenoch for her record – saying “she has failed the British public before and she will fail them again as leader of the Conservative Party”.
A nationwide police operation to track down those in grooming gangs has been announced by the Home Office.
The National Crime Agency (NCA) will target those who have sexually exploited children as part of a grooming gang, and will investigate cases that were not previously progressed.
Home Secretary Yvette Cooper said in a statement: “The vulnerable young girls who suffered unimaginable abuse at the hands of groups of adult men have now grown into brave women who are rightly demanding justice for what they went through when they were just children.
“Not enough people listened to them then. That was wrong and unforgivable. We are changing that now.
“More than 800 grooming gang cases have already been identified by police after I asked them to look again at cases which had closed too early.
“Now we are asking the National Crime Agency to lead a major nationwide operation to track down more perpetrators and bring them to justice.”
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1:40
Starmer to launch new grooming gang inquiry
The NCA will work in partnership with police forces around the country and specialist officers from the Child Sexual Exploitation Taskforce, Operation Hydrant – which supports police forces to address all complex and high-profile cases of child sexual abuse – and the Tackling Organised Exploitation Programme.
It comes after Sir Keir Starmer announced a national inquiry into child sex abuse on Saturday, ahead of the release of a government-requested audit into the scale of grooming gangs across the country, which concluded a nationwide probe was necessary.
The prime minister previously argued a national inquiry was not necessary, but changed his view following an audit into group-based child sexual abuse led by Baroness Casey, set to be published next week.
Ms Cooper is set to address parliament on Monday about the findings of the near 200-page report, which is expected to warn that white British girls were “institutionally ignored for fear of racism”.
One person familiar with the report said it details the institutional failures in treating young girls and cites a decade of lost action from the Independent Inquiry into Child Sexual Abuse (IICSA), set up in 2014 to investigate grooming gangs in Rotherham.
The report is also expected to link illegal immigration with the exploitation of young girls.
Career spy Blaise Metreweli will become the first woman to head MI6 in a “historic appointment”, the prime minister has announced.
She will take over from Sir Richard Moore as the 18th Chief, also known as “C”, when he steps down in the autumn.
“The historic appointment of Blaise Metreweli comes at a time when the work of our intelligence services has never been more vital,” Sir Keir Starmer said in a statement released on Sunday night.
“The United Kingdom is facing threats on an unprecedented scale – be it aggressors who send their spy ships to our waters or hackers whose sophisticated cyber plots seek to disrupt our public services.”
Of the other main spy agencies, GCHQis also under female command for the first time.
Anne Keast-Butler took on the role in 2023, while MI5 has previously twice been led by a woman.
Until now, a female spy chief had only headed MI6– also known as the Secret Intelligence Service (SIS) – in the James Bond movies.
Image: Blaise Metreweli is the first woman to be named head of MI6. Pic: Reuters
Dame Judi Dench held the fictional role – called “M” in the films instead of “C” – between 1995 and 2015.
Ms Metreweli currently serves as “Q”, one of four director generals inside MI6.
The position – also made famous by the James Bond films, with the fictional “Q” producing an array of spy gadgets – means she is responsible for technology and innovation.
Ms Metreweli, a Cambridge graduate, joined MI6 in 1999.
Unlike the outgoing chief, who spent some of his service as a regular diplomat in the foreign office, including as ambassador to Turkey, she has spent her entire career as an intelligence officer.
Much of that time was dedicated to operational roles in the Middle East and Europe.
Ms Metreweli, who is highly regarded by colleagues, also worked as a director at MI5.
In a statement, she said she was “proud and honoured to be asked to lead my service”.
“MI6 plays a vital role – with MI5 and GCHQ – in keeping the British people safe and promoting UK interests overseas,” she said.
“I look forward to continuing that work alongside the brave officers and agents of MI6 and our many international partners.”
Sir Richard said: “Blaise is a highly accomplished intelligence officer and leader, and one of our foremost thinkers on technology. I am excited to welcome her as the first female head of MI6.”
A woman has died after falling into the water at a popular beauty spot in the Scottish Highlands.
The 23-year-old had fallen into the water in the Rogie Falls area of Wester Ross.
Police Scotland confirmed emergency services attended the scene after being called at 1.45pm on Saturday.
“However, [she] was pronounced dead at the scene,” a spokesperson said.
“There are no suspicious circumstances and a report will be submitted to the Procurator Fiscal.”
Rogie Falls are a series of waterfalls on the Black Water, a river in Ross-shire in the Highlands of Scotland. They are a popular attraction for tourists on Scotland’s North Coast 500 road trip.