The two parties have reached a mutually satisfactory agreement and the legal case has been dropped, according to a statement given to Screen Daily.
They producers had claimed her last-minute departure caused delays on the Natalie Portman-starring Western.
The Scottish film-maker had previously denied reports she was being sued.
Ramsay's last film, an adaptation of the novel We Need to Talk About Kevin, starring Tilda Swinton, premiered to critical acclaim in competition in Cannes in 2011.
The film also earned her a Bafta nomination and the best director prize at the British Independent Film Awards.
Jane Got a Gun will tell the story of a woman who asks an ex-lover for help in saving her husband from a gang who want him dead.
Jude Law and Bradley Cooper also left the production shortly after Ramsay. The film will now be directed by Gavin O'Connor, with a cast including Ewan McGregor and Joel Edgerton.
"Jane Got a Gun Production LLC and Lynne Ramsay announce the pending civil action and all other disputes between the parties associated with Jane Got a Gun Motion Picture have been resolved privately and to their mutual satisfaction," said the statement published by Screen Daily.
It was not revealed whether the resolution involved a financial settlement. Ramsay herself has yet to comment.
Several sources claimed the disagreements involved delays and control of the film's final cut, with the Hollywood Reporter claiming Ramsay had not been presented with an approved schedule, script or budget days before shooting was set to begin.
In November, the Hollywood Reporter also published court papers, in which it was claimed Ramsay "was repeatedly under the influence of alcohol, was abusive to members of the cast and crew and was generally disruptive".
Ramsay later issued a statement saying she had not been served with that particular lawsuit.
"The allegations as recently reported are simply false," the statement added. "Lynne looks forward to presenting the truth about this situation in the proper forum."

The UK oil giant has said that fraud and false compensation payments are behind the escalating costs it faces.
But Judge Carl Barbier ruled that there was no "credible evidence of fraud" or that the compensation process was tainted by conflicts of interest.
BP said it continued to believe that the compensation system was being abused.
Former FBI director Louis Freeh is investigating allegations of misconduct in the claims program.
The oil company insists that the payouts should be suspended while Mr Freeh carries out his probe.
In an emailed statement to Bloomberg on Wednesday, BP said: "As we await the completion of this broad investigation [by Mr Freeh], we continue to believe a temporary pause in payments is warranted.
"BP is reviewing its options with respect to the district court's decision today."
The Deepwater Horizon oil rig explosion killed 11 workers and released an estimated four million barrels of oil into the Gulf of Mexico.
BP set up a compensation fund, initially estimating the cost of the settlement at $7.8bn (£5.03bn). The company has since raised the estimate to $9.6bn.

Officers found Matthew Williams, 34, attacking Ms Yemm in the Sirhowy Arms Hotel in Argoed, Caerphilly county on 6 November 2014.
He was stunned with a Taser and arrested at the scene but later died.
Healthcare Inspectorate Wales is looking at the mental health support Williams received before the killing.
Williams was known to mental health services at Aneurin Bevan, Abertawe Bro Morgannwg and Cardiff and Vale University health boards.
The health watchdog said its independent review would investigate the care, medical history and events surrounding the killing in a bid to "provide an understanding and background to the fatal incident".
The review will try to identify any change in Williams's behaviour, look at documents including risk assessments, assess how different agencies worked together and and interview staff involved in Williams's care.
It has published the terms of reference for the independent review, which was ordered by the Welsh government.
Inquests into Williams's and Miss Yemm's deaths are due to be held in the autumn.
Director Lynne Ramsay has settled a legal dispute with the producers of the film Jane Got a Gun, which she quit days before shooting began last year.
[NEXT_CONCEPT]
BP has lost a second attempt to suspend compensation payments over the 2010 Gulf of Mexico oil rig disaster.
[NEXT_CONCEPT]
A report to ensure "lessons are learnt" after a homeless prison leaver killed 22-year-old Cerys Yemm is to be published in early 2016.