Communication Division develops and disseminates United Nations Environment Programme (UNEP)'s core messages. It delivers them to governments and citizens, stakeholders and partners, including the media, through the full range of digital and traditional channels. The division advocates for environmental causes, engages the public including young people, and seeks to influence policy and practice on issues from pollution to green finance. It promotes and safeguards UNEP's identity.

Corporate Services Division safeguards UNEP’s corporate interests by providing it with tools and plans for efficient and effective management and by managing its exposure to risk. It does so in line with the core values of the United Nations as well as all other relevant rules, regulations and accountability requirements.

Economy Division provides solutions for economic decision-makers and helps change the business environment by offering platforms for dialogue and cooperation, innovative policy options, pilot projects and creative market mechanisms. It works through three main branches: Chemicals and Health; Energy and Climate and Resources and Markets.

Ecosystems Division supports countries in conserving, restoring and sustainably managing their terrestrial, freshwater and marine ecosystems, the biodiversity they contain and the products and services they provide for human well-being and prosperity. It addresses the environmental causes and consequences of disasters and conflicts. It helps countries reduce pollution from land-based activities, increase resilience to climate change and reflect linkages between poverty and the environment in their development planning.

Governance Affairs Office assists Member States, major groups and relevant stakeholders, such as the private sector, to engage with UNEP's work. The Office services UNEP’s governing body, the United Nations Environment Assembly, and its subsidiary organ, the Committee of Permanent Representatives, and manages their meetings. It helps strengthen the visibility, authority and impact of the Assembly as the authoritative voice on the environment.

Law Division is the lead Division charged with carrying out the functions of UNEP in the field of environmental law, governance and related policy issues.  The Division’s work focuses on: leading the international community in the progressive development of environmental law; supporting States in the development and implementation of legal, institutional and policy measures in response to major environmental challenges; facilitating cooperation and coordination among multilateral environmental agreements and between UNEP and those agreements; working with MEA secretariats to support Parties to the respective MEAs in implementing their treaty obligations; and facilitating policy dialogue among States on issues relating to international environmental law and governance.

Policy and Programme Division consolidates the policy, programme, monitoring, gender and social safeguards functions of UNEP as well as its engagement with the United Nations system and key global processes such as the 2030 Agenda. The Division ensures coherence and coordination at the strategic, policy and programmatic levels.

Science Division provides timely, scientifically credible, policy-relevant environmental assessments, data and information for decision-making and action planning for sustainable development. It monitors, analyses and reports on the state of the global environment, assessing policies and trends and providing early warning of emerging environmental threats. It spearheads UN-wide monitoring and reporting on the environmental dimension of the 2030 Agenda and SDGs.