Martin O’Brien (born in Belfast, Northern Ireland in October 1964) is a human rights activist and charity administrator in Northern Ireland. Since 2004 O’Brien has been employed by Atlantic Philanthropies, a grant making programme which works to bring about lasting changes in the lives of disadvantaged and vulnerable people in Northern Ireland, the Republic of Ireland, South Africa and the United States by promoting peace-building and access to human rights. In 2011, O'Brien was appointed Senior Vice-President of Programmes at Atlantic.