Marwa has conducted several certifying trainings from national and international NGOs in leadership, peaceful conflict resolution, gender issues, nonviolent education, intercultural dialogue, the fight against extremism and others. She had the opportunity to participate in several international events to promote intercultural dialogue in different countries, such as her participation in Amnesty International Berlin 2012, as she was among the participants of the "Dawrak" project of the Anna Lindh Foundation in 2014. Also, she participated in the information session of the Universal Periodic Report (UPR), 2016, at the United Nations-Geneva and her intervention was on the rights of minorities.

For 4 years Marwa Mansouri has been a consultant for various NGOs. She is president of the association "Growing peace" since 2013. She is also founder and general secretary of the association "Coexistence", member of the International Alliance for Peace, the Arab Network of Human Rights and the universal union for peace.