The former prostitutes had delivered dramatic testimony during the trial of how they felt powerless to say no to Strauss-Kahn sodomising them during sex parties.
But their lawyer said they felt unable to prove that the former political heavyweight knew the women were prostitutes and were dropping their civil case against him.
It was running in parallel to the criminal trial in which Strauss-Kahn and 13 others are charged with pimping and could face up to 10 years in prison.
The trial in the northern city of Lille has entered its third and final week, with lawyers and prosecutors set to sum up their cases after a fortnight of often lurid accounts about the orgies.
Strauss-Kahn has testified to having orgies while he was managing the world financial crisis, to being “rough” with his sexual “conquests”, and to needing sex with exceptional frequency.
But no obvious evidence has emerged that Strauss-Kahn did anything illegal. It is looking increasingly likely the one-time presidential contender will walk away with a clean criminal record.
Strauss-Kahn is accused of aggravated pimping over a series of sex parties in France, Washington, and Brussels, while leading the IMF, and while married.
He insists he didn’t know the women involved were prostitutes.
Two of his co-defendants say they recruited and paid the women themselves, and built a wall of silence to ensure Strauss-Kahn wasn’t aware.
Even the prosecutor didn’t think there was enough of a case against Strauss-Kahn, and argued in 2013 against including him in the trial.
Under French law, investigating judges can override prosecutors’ recommendations and send someone to trial anyway, which they did with Strauss-Kahn.
He faces up to 10 years in prison and €1.5m in fines if convicted. But prosecutor Frederic Fevre could argue for acquittal for Strauss-Kahn in closing arguments today, focusing instead on getting convictions for other defendants accused in a large prostitution ring out of the Hotel Carlton in Lille.
Strauss-Kahn has openly testified to extravagant sex, but said that he thought the women present were “libertines” like himself.