Oxfam is to set up an independent commission to investigate claims of sexual exploitation.
Oxfam International executive director Winnie Byanyima promised to root out any wrongdoing at the charity and provide justice for anyone abused by its staff.
In an interview with the BBC, Ms Byanyima apologised for the scandal which has seen the charity accused of concealing findings of an inquiry into claims staff used prostitutes while delivering aid in Haiti in 2011.