The Role of the UN Secretary-General
Backgrounder

The Role of the UN Secretary-General

The United Nations’ top leadership position has broad authority to steer the organization’s agenda. Yet its impact has varied widely since 1946, shaped by global crises, political constraints, and personal diplomacy.
UN Secretary-General António Guterres poses for a photo at the UN Headquarters, July 22, 2025.
UN Secretary-General António Guterres poses for a photo at the UN Headquarters, July 22, 2025. Adam Gray/Associated Press
Summary
  • The secretary-general, appointed by the General Assembly’s 193 member states, serves as the chief administrative officer of the United Nations.
  • Common responsibilities include making appointments to UN posts, overseeing peacekeeping missions, mediating conflict, and coordinating UN responses to global emergencies.
  • Previous secretaries-general have often struggled to balance the role’s competing interests. Current officeholder António Guterres has focused on climate change, peace and human rights, and UN reform.

Introduction

The United Nations’ first secretary-general, Trygve Lie, called it the most difficult job in the world. Some of the difficulty lies in the job description. Though U.S. President Franklin D. Roosevelt, several years before the United Nations’ creation, saw the secretary-general’s role as that of a “world moderator,” the UN Charter formally defines the secretary-general as the body’s “chief administrative officer.” Each of the nine secretaries to date has tended to favor one of these two approaches to the role.

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The current secretary-general, former Portuguese Prime Minister António Guterres, has spent his two terms focused on advancing sustainable development, promoting peace and human rights, and reforming the UN system—all while facing a staggering range of crises, including worsening climate change, the COVID-19 pandemic, and wars in the Gaza Strip, Ukraine, and elsewhere. While all secretaries-general have confronted varying challenges, what appears to be constant is the ambiguous nature of the position itself—a role bifurcated between the tasks of “secretary” and “general,” often leaning more toward the former.

What is the UN secretary-general?

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Beyond the role of chief administrative officer, the UN Charter leaves the secretary-general’s desired qualities, candidate selection process, and length of tenure open to interpretation. The UN website describes the role as “equal parts diplomat and advocate, civil servant, and CEO.”

The secretary-general is required to uphold the values of the United Nations, even at the risk of challenging member states. For example, when tensions escalated between Serbs and ethnic Albanians in Kosovo in 1999, Secretary-General Kofi Annan (1997–2006) famously said that “no government has the right to hide behind national sovereignty in order to violate human rights.” Still, in the book Secretary or General?, international law experts Simon Chesterman and Thomas M. Franck write that the officeholder is sometimes treated as “an errand boy and punching bag,” expected to be both an independent political force and a public servant.

Despite the broad and vague requirements of the job, some informal norms are observed in appointments for the post. Secretaries-general usually come from countries considered to be small- or medium-sized neutral powers. To date, all appointees have been male career diplomats. They generally serve no more than two five-year terms. Although no Eastern European has held the seat yet, regional rotation is observed. The five permanent members of the Security Council—China, France, Russia, the United Kingdom, and the United States, known as the P5—traditionally avoid nominating their own nationals to the post.

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Does the secretary-general play a political role?

Yes, Article 99 of the UN Charter says the secretary-general “may bring to the attention of the Security Council any matter which in his opinion may threaten the maintenance of international peace and security.” This provision allows the secretary-general to choose between playing an activist role—in the tradition of Dag Hammarskjöld (1953–1961), who died in a plane crash while flying to ceasefire negotiations in Northern Rhodesia (now Zambia)—or more of a bureaucratic role, as Kurt Waldheim (1972–1981) did.

Annan was considered an activist secretary-general and won a Nobel Peace Prize, but he faced much criticism during his tenure, including for his management of the Oil-for-Food program in Iraq. His successor, Ban Ki-moon (2007–2016), was seen as more of an administrator; he successfully pushed forward the 2015 Paris Agreement on climate change and increased the number of women in UN senior management. However, he too faced criticism, including for his handling of the Haiti cholera crisis.

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Guterres, who won a second term in 2021, has urged world powers—namely the United States and China—to overcome tensions and work together to confront global challenges. He has championed efforts to combat climate change, calling out governments and companies for “adding fuel to the flames,” and has sought to advocate for human rights, building on his previous experience as chief of the UN refugee agency. In a July 2025 speech, amid multiple ongoing global crises, Guterres called on states to defend human rights “consistently and universally, even or especially when inconvenient.”

However, some critics say that he hasn’t done enough to publicly condemn human rights abuses, especially those by powerful countries like the United States, China, Israel, and Russia. As a result of his quiet diplomacy approach, Guterres “is becoming defined by his silence on human rights,” wrote then Executive Director of Human Rights Watch Kenneth Roth in 2019. 

Nevertheless, Guterres has repeatedly called for peace in the wars in Europe and the Middle East. He has met separately with the leaders of Russia and Ukraine, as well as Israel and the Palestinian Authority. He has mainly focused on humanitarian needs, such as guaranteeing aid deliveries and creating evacuation corridors.

What are the main responsibilities of the secretary-general?

Administrative. The secretary-general oversees the UN Secretariat—which functions as the United Nations’ executive office—and handles its operations, including research, translation, and media relations. The Secretariat has a staff of more than thirty-six thousand and each secretary-general has handled his administrative responsibilities differently. Hammarskjöld established a system of offices in charge of legal, political, personnel, and budgetary aspects of the secretariat, while Boutros Boutros-Ghali (1992–1996) added undersecretaries-general to oversee operations. During Annan’s administration, the deputy secretary-general position was created to handle day-to-day operations. Under Guterres, the protocol for delegating authority in the Secretariat was revised and two new management departments were created.

Human Resources. The secretary-general appoints undersecretaries to more than fifty UN posts, including the heads of agencies such as the UN Children’s Fund and the UN Development Program—though these appointments are often made in consultation with member states or executive boards. Member states often lobby to fill these posts with their nationals, highlighting the secretary-general’s role in ensuring broad regional representation in UN leadership.

Peacekeeping. The secretary-general’s office oversees peacekeeping missions and appoints the undersecretary in charge of that department, which manages approximately a dozen operations worldwide. While the General Assembly or Security Council can initiate a peacekeeping mission, operational control rests with the Secretariat. Guterres has introduced several reforms to the UN peace and security framework, including his Action for Peacekeeping initiative in 2018. This effort aims to strengthen peacekeeping operations by implementing reforms across eight major areas, including increasing gender parity among peacekeepers, improving coordination with local governments, and strengthening accountability for misconduct.

Mediation. As part of the “good offices” responsibility of the position, the secretary-general practices independence and impartiality to prevent and limit conflict. Examples of UN leaders taking on mediation roles in the past include Hammarskjöld’s promotion of an armistice between Israel and Arab states and efforts by Javier Pérez de Cuéllar (1982–1991) to negotiate a ceasefire to end the Iran-Iraq War. The secretary-general also appoints envoys charged with brokering peace deals. However, because these envoys report to the Security Council, their appointments can often be influenced by the preferences of the council’s members. In 2017, for example, the United States blocked Guterres’s appointment of former Palestinian Prime Minister Salam Fayyad as envoy to Libya. The intervention raised the question of whether such appointments are subject to approval by the Security Council, as the UN Charter authorizes the secretary-general to make the decision.

How is the secretary-general appointed?

The Security Council recommends a candidate for the General Assembly’s 193 members to appoint. Although all UN members get a voice in the secretary-general’s selection, the five permanent members of the Security Council hold the most influence. Any one of them can eliminate a nominee with a veto. For example, China vetoed a third term for the fourth secretary-general, Austria’s Waldheim, while the United States vetoed a second term for the fifth, Egypt’s Boutros-Ghali. Candidates need at least nine votes from the Security Council to be recommended as secretary-general, so the body’s ten elected members still hold crucial power despite lacking veto authority.

However, some critics of the appointment process say it lacks transparency and falls prey to cronyism due to the permanent Security Council members’ veto power and their secret negotiations over candidates. The selection of Guterres in 2016 was more open than any previous election, with a televised town hall meeting and informal dialogues between the candidates and the General Assembly.

What is the secretary-general’s relationship with the Security Council?

The secretary-general is tasked with upholding the interests of underrepresented states and balancing the demands of the Security Council with those of General Assembly members. The relationship between the Security Council’s five permanent members and the secretary-general is similar to one between constituents and their elected representatives.

Critics say the structure of this relationship has made the secretary-general beholden to Security Council members, particularly the United States, which is the United Nations’ largest funder and host to its headquarters. “No secretary-general can afford to alienate the United States if they want to have success in the job,” said UN expert Stephen Schlesinger.

Proponents of UN reform often criticize the Security Council’s veto powers for obstructing efforts to respond to humanitarian calamities and violations of international law. “When the P5 agree, the Security Council possesses almost unlimited potential authority,” Richard Folk and Hans von Sponeck wrote in their book, Liberating the United Nations. But when they disagree, the council “is generally paralyzed.”

For example, Russia’s veto power prevented the United Nations from taking action against Moscow’s invasion of Ukraine in 2022. “What the crisis has revealed are the inherent limitations of any structure of international peace that depends on great power unanimity,” wrote former CFR Senior Fellow Stewart M. Patrick. Meanwhile, the United States has often used its veto power to protect Israel from Security Council decisions related to the Israeli-Palestinian conflict.

The secretary-general often struggles to balance the interests of other large funders and powerful member states. Threatened with the substantial defunding of certain humanitarian operations in 2016, Ban acquiesced to Saudi Arabia’s demand to remove a Saudi-led coalition in Yemen from a list of groups that had exploited children. Similarly, despite repeatedly calling on the Security Council to intervene in Syria’s civil war, Ban was unable to reconcile council members’ divergent concerns, resulting in their failure to adopt a unified multilateral response. Ban later stated that “the Syrian tragedy shames us all.”

What is likely to be the future focus of the secretary-general?

While the secretary-general is likely to continue focusing on the world’s most pressing issues, including climate change and global health crises, competition among powerful member states is increasingly undercutting their ability to facilitate international peace and security.

“The Security Council was set up so that no enforcement action could be authorized against the wishes of one of its five permanent members,” Patrick said. “As the scope of great-power competition extends to new regions and issue areas, the secretary-general will inevitably find it more difficult to engineer workable Security Council majorities to back his conflict mitigation and resolution efforts.”

As the effects of climate change worsen and unresolved conflicts grow deadlier in places including Gaza, the Democratic Republic of Congo, Myanmar, Sudan, and Ukraine, Guterres has pledged to develop a more unified United Nations that responds with collective action. 

“We are moving towards a new global order and a multipolar world,” Guterres said in July 2023. “This new era is already marked by the highest level of geopolitical tensions and major power competition in decades.”

Guterres has said he will continue to prioritize reforming the United Nations, having already put forth a series of initiatives since taking office in 2017. In 2021, for example, Guterres released a sweeping report titled Our Common Agenda, in which he called for revamping the UN system, saying it was failing to deal with global challenges such as climate change. The report outlined actions governments could take to advance the Sustainable Development Goals, including expanding health-care coverage, broadening internet access, and supporting developing countries as they confront climate change. 

Then in March 2025—in what experts say is his largest proposed overhaul—Guterres launched the UN80 Initiative, a set of sweeping structural reforms aimed at making the organization more agile, integrated, and better equipped to respond to contemporary global challenges. The plan involves  cutting costs, consolidating various UN agencies, and making the United Nations more accountable to its members.

Recommended Resources

These Backgrounders explain the role of the UN General Assembly and the UN Security Council.

In a 2023 policy brief, Guterres laid out “a new agenda for peace.” 

The United Nations profiles Guterres’s journey to becoming secretary-general.

The University of Pretoria’s Danny Bradlow reflects on Kofi Annan’s legacy after his death in 2018.

Diana Roy, Ellora-Onion De, Lindsay Maizland, Melissa Manno, and Chelsea Padilla contributed to this Backgrounder. Will Merrow created the graphic.

For media inquiries on this topic, please reach out to [email protected].
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