The critics of Mr Corbyn’s leadership signed a full-page advert with is to appear in a number of local newspaper titles across Labour heartlands in the North of England.
Organised by anti-extremism campaign group Mainstream, the advert will claim that Labour under its current leader will deliver the “opposite” of a fairer, safer society.
"We were all lifelong Labour voters and all former Labour MPs. We are voting for different parties at this election, but we have all come to the difficult decision not to vote Labour,” it will read.
It is not the first time Ian Austin, leader of Mainstream and one of the ringleaders behind the move, has called on voters to defeat Mr Corbyn's Labour at Thursday's election.
Using Conservative Party campaign cash, the former Dudley North MP wrote to voters in marginal seats earlier this month urging them to support Boris Johnson for prime minister.
The former minister has been joined in backing Wednesday's advertising blitz by the likes of Dame Louise Ellman, the ex-Liverpool Riverside MP who resigned in October over the party's record on dealing with anti-Semitism in its ranks, and Vote Leave chairwoman Gisela Stuart, who last month appeared alongside Mr Johnson to endorse him at a Tory election rally.
Other signatories include those who walked out of Labour to form Change UK in February - Ann Coffey, Mike Gapes, Chris Leslie, Joan Ryan and Gavin Shuker - as well as former Lewisham West and Penge MP Jim Dowd and Liberal Democrat defector Rob Flello.
Tom Harris, an MP of 14 years, ex-High Peak MP Tom Levitt, Ivan Lewis, Michael McCann and John Woodcock make up the rest of the 15 critics of Mr Corbyn.
Mr Austin, a former Gordon Brown ally, said it would be a "disaster" for the country if voters put Mr Corbyn into Downing Street.
"This is a hard decision for Labour supporters to make," he said. "It was extremely difficult for me and the other former Labour MPs involved too. But the risk is just too great.
"If Jeremy Corbyn enters Downing Street on Friday, it would be a disaster for the United Kingdom.
"The Labour Party under Jeremy Corbyn has changed beyond recognition. It is no longer the party myself and millions of other Labour voters supported all our lives. I'm urging all decent Labour voters not to back Jeremy Corbyn on Thursday."