The star of "Good Will Hunting" said she will no longer support the organization following its response to a sex abuse scandal in Haiti after its 2010 quake.
SINCE news broke of the sex scandal in Haiti Oxfam has been working hard to retain vital funding from government and supporters.
Amid the allegations, Penny Lawrence, deputy chief executive of Oxfam GB resigned on Monday, saying she was "ashamed" by the situation and took "full responsibility".
British actress Minnie Driver has cut ties with Oxfam after 20 years of support.
The former Oxfam employee, whose name has been changed, worked under Mr Van Hauwemeiren at the time and said there was a culture of abuse, which included sexual harassment, in the Port-au-Prince office.
However, she added that the "abhorrent mistakes of a troubling organization" would not stop her in her charity work.
"All I can tell you about this very bad revelation about Oxfam is that I am devastated", the Oscar-nominated actress wrote on Twitter.
One of these workers went on to work at the Catholic Agency for Overseas Development (CAFOD), which is the official Catholic aid agency for England and Wales.
Winter Olympics opening ceremony sees Intel use record 1218 drones
NBC aired a light show, but it was from Intel's launching of more than 1,200 drones in December in Pyeongchang. It features built-in LED lights able to create over 4 billion color combinations.
The comments add to the condemnation anti-poverty charity Oxfam has received since the Times of London revealed that some staff members paid for sex while working in Haiti among people devastated by the 2010 quake.
Oxfam now faces a battle to prevent other high-profile ambassadors from stepping down as well as making sure the United Kingdom government does not withdraw the £32 million (Dh163m) of funds it receives.
Minnie Driver: "I dream of a farm, and making bread".
When abuse is carried out "by people in positions of power, people we entrust to help and protect, it rightly sickens and disgusts and compels us to take action", she said.
"We have robust safeguarding and whistle-blowing policies and practices in place to ensure that vulnerable people are protected", he said.
Haiti's minister of planning and external cooperation, Aviol Fleurant, said on Wednesday he had summoned Oxfam representatives to a meeting on Thursday to discuss "serious sexual crimes".
"Charities and dedicated, hard-working aid workers undertake vital, lifesaving work in some of the most hard circumstances across the world", the commission's deputy chief executive David Holdsworth said.
"We regret that we did not act on Helen's concerns much quicker and with more resources", the statement said, adding it was now expanding the safeguarding team.
Seven percent of staff in South Sudan - four people - witnessed or experienced rape or attempted rape involving colleagues.