Lord Sugar's trusty business advisor has been a major part of the series since it began in 2005 so we're gutted to hear he's quitting.
Nick tweeted: "So farewell Apprentice - it's been 10 years of fun working on a worthwhile show but now it's time to file the notebook and throttle back. Bye".
Lord Sugar responded by saying: "You will be missed."
He later added: "It's with a heavy heart I have to say farewell to my good friend Nick Hewer from the apprentice. I thank him sincerely for the past 10 years."
Nick, 70, announced his departure just as he filmed the series finale alongside Lord Sugar and fellow business advisor Baroness Karren Brady.
He said in a statement that he'd been thinking recently about the right time to leave the show and now that time had come.
"I've been pondering my departure from The Apprentice for a while and have decided that year 10 is the appropriate time," he said.
"So I leave with relief, tinged with regret. Anyone can do what Karren and I have been doing, but it takes stamina to follow the candidates week after week, and my stamina is not up to those long weeks."
Nick added: "I think The Apprentice is a truly valuable programme, teaching young people the basics of business - not in a classroom setting, but in a wonderfully entertaining format. And the winners each year validate the value of the show - talented, creative and hardworking young people, all of whom are making a great success of their businesses
"I shall continue to enjoy the show from my armchair, marvelling at the candidates' self-esteem, at the sky-high production values of the producers and at the extraordinary talent of my old friend Alan Sugar."
Aww, Nick, we'll miss you! And your amazing facial expressions, ability to convey a million words with just one look and disapproving glances in the background when candidates are making mistakes...
A replacement hasn't been announced.
The Apprentice's current series ends on Sunday night, when the winner of Lord Sugar's £250,000 business investment will be named.
Nick continues to host Countdown on Channel 4.
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