This is a question that invites both factual analysis and genuine debate rather than a simple search query, so let me share some perspective on it.
The case that it's still relevant
The UN remains the only truly universal forum where nearly all 193 countries meet, and it performs functions that are hard to replicate elsewhere:
•Humanitarian and development work: Agencies like UNHCR, WFP, UNICEF, and WHO deliver aid, vaccines, food, and refugee support to hundreds of millions of people annually. This operational infrastructure is enormous and largely uncontroversial compared to the political UN.
•Peacekeeping: Tens of thousands of UN peacekeepers are deployed across conflict zones. They don't always succeed, but in many cases they've helped stabilize ceasefires or protect civilians.
•International law and norms: Treaties on climate (Paris Agreement), nuclear non-proliferation, human rights, and the law of the sea were negotiated under UN auspices. Even imperfect, these frameworks shape state behavior.
•A forum for dialogue: Even adversarial states talk to each other at the UN, which has diplomatic value simply by keeping channels open.
The case that it's struggling or increasingly irrelevant
•Security Council paralysis: The veto power held by the US, Russia, China, UK, and France means the Council is often deadlocked on exactly the crises that matter most—Syria, Ukraine, Gaza. Major powers routinely act unilaterally or through other coalitions when the UN can't act.
•No enforcement teeth: The UN can pass resolutions, but lacks its own military or reliable means to compel compliance from powerful states.
•Credibility problems: Bodies like the Human Rights Council have been criticized for including member states with poor human rights records, undermining moral authority.
•Outdated structure: The Security Council's permanent membership reflects the power structure of 1945, not 2026—there's no permanent seat for India, Brazil, most of Africa, etc., and reform efforts have stalled for decades.
•Funding and buy-in crises: Major contributors (notably the US) have periodically withheld dues or reduced funding, and some powers increasingly bypass the UN for coalitions of the willing.
A fair overall take
The honest answer is probably "it depends which UN you mean." The political UN (Security Council, General Assembly resolutions) is often sidelined on the hardest geopolitical conflicts because great-power rivalry makes consensus impossible—this is a design feature of 1945, not a new failure. But the operational UN (humanitarian agencies, peacekeeping, specialized bodies like WHO or IAEA) continues to do work that would be very hard to replace, even if imperfectly.
So it's less "is the UN relevant" and more "relevant for what, and to whom"—it's simultaneously indispensable plumbing for global cooperation and a frequently paralyzed political body when great powers disagree.
If you want, I can look into a specific angle—like recent UN reform debates, its role in a particular ongoing conflict, or how its funding crisis is playing out right now.