Peace and conflict studies is a social science field that identifies and analyzes violent and nonviolent behaviors as well as the structural mechanisms attending conflicts (including social conflicts), to understand those processes which lead to a more desirable human condition. A variation on this, peace studies, is an interdisciplinary effort aiming at the prevention, de-escalation, and solution of conflicts by peaceful means, based on achieving conflict resolution and dispute resolution at the international and domestic levels based on positive sum, rather than negative sum, solutions.

In contrast with strategic studies or war studies, which focus on traditionally realist objectives based on the state or individual unit level of analysis, peace and conflict studies often focuses on the structural violence, social or human levels of analysis.

Disciplines involved may include philosophy, political science, geography, economics, psychology, communication studies, sociology, international relations, history, anthropology, religious studies, gender studies, law, and development studies as well as a variety of others. Relevant sub-disciplines of such fields, such as peace economics, may also be regarded as belonging to peace and conflict studies. The study of peace is also known as irenology.

Peace and conflict studies is both a pedagogical activity, in which teachers transmit knowledge to students; and a research activity, in which researchers create new knowledge about the sources of conflict. Peace and conflict studies entails understanding the concept of peace which is defined as political condition that ensures justice and social stability through formal and informal institutions, practices, and norms.

Academics and students in the world's oldest universities have long been motivated by an interest in peace. American student interest in what we today think of as peace studies first appeared in the form of campus clubs at United States colleges in the years immediately following the American Civil War. Similar movements appeared in Sweden in the last years of the 19th century, as elsewhere soon after. These were student-originated discussion groups, not formal courses included in college curricula. The first known peace studies course in higher education was offered in 1888 at Swarthmore College, a Quaker school.

The First World War was a turning point in Western attitudes to war. At the 1919 Peace of Paris—where the leaders of France, Britain, and the United States, led by Georges Clemenceau, David Lloyd George, and Woodrow Wilson respectively, met to decide the future of Europe—Wilson proposed his famous Fourteen Points for peacemaking. These included breaking up European empires into nation states and the establishment of the League of Nations. These moves, intended to ensure a peaceful future, were the background to a number of developments in the emergence of Peace and Conflict Studies as an academic discipline. The founding of the first chair in International Relations at Aberystwyth University, Wales, whose remit was partly to further the cause of peace, occurred in 1919.

After World War II, the founding of the UN system provided a further stimulus for more rigorous approaches to peace and conflict studies to emerge. Many university courses in schools of higher learning around the world began to develop which touched upon questions of peace, often in relation to war, during this period. The first undergraduate academic program in peace studies in the United States was developed in 1948 by Gladdys Muir, at Manchester University a liberal arts college associated with the Church of the Brethren. It was not until the late 1960s in the United States that student concerns about the Vietnam War forced ever more universities to offer courses about peace, whether in a designated peace studies course or as a course within a traditional major. Work by academics such as Johan Galtung and John Burton, and debates in fora such as the Journal of Peace Research in the 1960s reflected the growing interest and academic stature of the field. Growth in the number of peace studies programs around the world was to accelerate during the 1980s, as students became more concerned about the prospects of nuclear war. As the Cold War ended, peace and conflict studies courses shifted their focus from international conflict and towards complex issues related to political violence, human security, democratisation, human rights, social justice, welfare, development, and producing sustainable forms of peace. A proliferation of international organisations, agencies and international NGOs, from the UN, Organization for Security and Co-operation in Europe, European Union, and World Bank to International Crisis Group, International Alert, and others, began to draw on such research.

Critical theory agendas relating to positive peace in European academic contexts were already widely debated in the 1960s. By the mid-1990s peace studies curricula in the United States had shifted "...from research and teaching about negative peace, the cessation of violence, to positive peace, the conditions that eliminate the causes of violence." As a result, the topics had broadened enormously. By 1994, a review of course offerings in peace studies included topics such as: "north-south relations"; "development, debt, and global poverty"; "the environment, population growth, and resource scarcity"; and "feminist perspectives on peace, militarism, and political violence".