The philosopher who advocated for peace and non-violence during the Vietnam War was Martin Luther King Jr.. His principles of non-violence and civil disobedience became a guiding framework for resistance to war and injustice. King expressed strong opposition to U.S. involvement in Vietnam, linking the war to issues of social justice and poverty. His advocacy for peace during this tumultuous period underscored the interconnectedness of various human rights struggles, influencing public perception and dissent.