The former shadow cabinet minister, who was a central figure in Labour's campaign, was narrowly defeated in Leicester South by an independent candidate, Shockat Adam, in one of the biggest upsets of election night.
Ashworth, who was involved with Labour's preparations for government as well as its attack operation against the Conservatives, will now head Labour Together.
The high-profile appointment is a sign the thinktank will play a pivotal role in Keir Starmer's government.
Ashworth's experience in government includes advising Gordon Brown while he was chancellor and he is highly valued by Starmer.
"Over the last decade, Labour Together has played a vital role in advancing progressive politics and helping Labour to return to power," Ashworth said.
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Denne historien er fra July 10, 2024-utgaven av The Guardian.
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