BBC says it will not replace Evans on Top Gear
Evans, 50, dramatically posted online he would not be returning to the revamped motoring programme after it received falling ratings and scathing reviews.
And his shock announcement came just hours after police revealed he will be investigated over claims he sexually assaulted a woman in the 1990s.
The Radio 2 presenter revealed his decision - which he made on 'his own' - after the series ended with a record low audience as fewer than two million people tuned in on Sunday night.
He wrote on Twitter: 'Stepping down from Top Gear. Gave it my best shot but sometimes that's not enough. The team are beyond brilliant, I wish them all the best.'
Evans added: 'Full steam ahead then with Radio 2, CarFest, Children In Need, 500 Words and whatever else we can dream up in the future.'
Fans of the show were quick to respond to his announcement, adding that it was the 'best news this year'.
The BBC also revealed that they will not replace Evans and added that they plan to carry on 'with no changes to the current line up'.
A BBC spokesman said: 'Series 24 starts filming in September and we plan to continue with no changes to the current line up.
'Top Gear is an ensemble piece in terms of presenters and will continue to be so. Chris made the decision to leave on his own.'
Their decision to not replace Evans could mean that his former co-host Matt LeBlanc may have a more prominent role.
Meanwhile, the BBC confirmed that they did not ask Evans to step down and his decision leaves racing driver Sabine Schmitz, F1 star Eddie Jordan, YouTube star Chris Harris, motoring journalist Rory Reid and The Stig in the presenting team.
The announcement that Evans is to quit the show after just one series came just hours after the Metropolitan Police confirmed in a statement that a woman had made an allegation of 'non-recent sexual assault', said to have taken place in the Tower Hamlets area of London in the 1990s.
The allegation comes just two months after the presenter was accused of grabbing a colleague's breasts and 'flashing her almost every day for two years'.
And those on Twitter today posted that his resignation had 'made their day', while others added that they may now will tune into the show following his departure.
Jamie Trapp wrote: 'Chris Evans stepping down from top gear is the best news I've heard this year!'
Meanwhile, other users dubbed his departure 'Chrexit' and many said his decision to leave was 'brilliant' and 'amazing'.
In a statement, Evans added: 'I have never worked with a more committed and driven team than the team I have worked with over the last 12 months. I feel like my standing aside is the single best thing I can now do to help the cause.
'I remain a huge fan of the show, always have been, always will be. I will continue to focus on my radio show and the allied events that it encompasses.'
Mark Linsey, director of BBC Studios, said: 'Chris is stepping down from his duties on Top Gear. He says he gave it his best shot doing everything he could to make the show a success.
'He firmly believes that the right people remain, on both the production team and presenting team, to take the show forward and make it the hit we want it to be.'
Sources told The Sun that the Radio 2 presenter will be spoken to 'in the near future' by officers investigating the complaint made by a former colleague.
The claim comes just two months after he was accused of grabbing a colleague's breasts.
The woman said she worked with Evans in the 1990s and she was 'bullied' by him after rejecting his advances, with her complaints falling on deaf ears.
But Evans has hit out at what he has called a 'witch hunt' around him that has had a 'devastating' effect on his family.
Speaking anonymously in May, the woman said she was 'sent to Coventry' after spurning the Radio 2 DJ's advances and that he 'told colleagues not to talk to her'.
The former colleague said she was speaking out to prevent others becoming victims of his 'bullying behaviour'.
She said she sought legal advice over her claims several years ago, particularly around the 'flashing', which she said was a tactic to 'punish those who didn't do what he wanted'.
Several of the presenter's former colleagues took to social media also accusing him of bullying.
But the star himself has called the allegations 'ridiculous' and has denied ever being a bully.
In May, speaking ahead of the Top Gear relaunch, he told the Daily Mail: 'Yes, I lose my rag. But not like I used to. I used to be a big shouter and screamer. But I don't bully people. And I didn't get my willy out. I wouldn't be showing it off like a megalomaniac — I wish I had reason to.'
Mark Linsey, Director of BBC Studios and Bob Shennan, Controller of Radio 2, have also denied claims that Evans had a 'volatile' working behaviour.
The motoring show has struggled to attract viewers since Evans took the wheel, and yesterday's Top Gear finale attracted fewer viewers than any Jeremy Clarkson episode.
The screening, which featured Hollywood actor Patrick Dempsey, drew an average of 1.9million people and an 8.7 per cent share of the available viewing audience.
The BBC declined to comment on the audience figures as the show, presented by Evans and Matt LeBlanc, lost out to ITV's coverage of Euro 2016.
The commercial channel's broadcast of France's 5-2 victory over Iceland averaged 6.6million viewers and a 31.4 per cent share, according to audience measurement organisation, BARB.
A friend of Evans told the Daily Telegraph that Evans decided to leave the programme because of the 'battering' he had faced.
'Every single day he's been accused of something else. In the end you just think "f*** off".
'If the show had done better in the ratings, perhaps the battering would have been less fierce. Who knows.'
Daily Mail TV critic Christopher Stevens gave the show a one-star rating.
He said: It’s becoming obvious that many licence-payers want to see Evans kicked off the show. They find everything about the man irritating — his mouldy grey beard, his 110db whinging, even the way his jeans don’t quite reach his boots.
'Evans, LeBlanc and their innumerable sidekicks tackled childish challenges, tested earsplitting supercars, and raced across glorious landscapes — but they did it all so fervently.
'The old Top Gear, with its eternal schoolboys running amuck, was a spree. Even when they were driving to the North Pole, or provoking a second Anglo-Argentine conflict, it was just an outrageous lark. Under new management, Top Gear has become so pompous that it disappeared up its own exhaust pipe.'
Over the last six weeks, Top Gear has struggled to make an impact in the overnights - the figures for the previous day's viewing.
It launched over a Bank Holiday weekend with 4.4million viewers on May 29, but plummeted to 2.8 million in the second outing.