We Will Miss Denis J. Halliday

By World BEYOND War, October 14, 2026 — Updated October 21, 2026

In memory and celebration of the life and humanitarian work of Denis J. Halliday

Former Irish diplomat and Assistant United Nations Secretary General Denis J. Halliday died on Sunday 11 October 2026. I attended his memorial service at the Quakers Friends Meeting House in Dublin Ireland on October 20^th. It was a beautiful and appropriate service as one would expect from the Quakers community. Like Denis I was associated with the UN, in my case as a military peacekeeper and as a civilian with the UN Volunteer service. Like Denis I learned to appreciate the importance of the vital roles that the United Nations was established to perform in matters of international peace and global justice, and as one of the foundation stones of international law and global jurisprudence. I got to know Denis well in recent decades through his campaigning with several peace groups in Ireland including World Beyond War. We also shared a love of the beautiful areas of Connemara in the west of Ireland. I had many discussions with Denis on these matters and we both agreed that the UN was prevented from reaching its full potential by the corruption and abuses of the UN Security Council veto system by several of the five UNSC permanent members. This amounted to serious breaches of the UN Charter by those whose duty it was, and still is, to uphold the purposes and principles of the UN Charter. When Denis was appointed as Humanitarian Coordinator in Iraq, with responsibility to administer the UN sanctions on Iraq, he was appalled to find that these sanctions were causing the deaths of hundreds of thousands of Iraqi children under five years of age. When his reports and complaints to his UN superiors were ignored, or not acted on, his sense of justice and integrity left him with no option but to resign from the UN in 1998 in order the expose these crimes against Iraqi children and their families. Count Hans von Sponeck from Germany was appointed to replace Denis Halliday, but he also resigned from the UN in 2000 for similar reasons, demonstrating that there were people of integrity at all levels including senior levels within the UN.

Instead of giving up on his devotion to humanitarian work, Denis became very active in campaigning within Ireland and internationally against all wars and for international peace and justice and in favour of maintaining active Irish neutrality.

The following short obituary posted by his family on www.rip.ie gives just a summary of some of the great and tireless work that Denis has achieved while working with the UN for 34 years and during the 28 years in a personal capacity since he resigned from the UN. It would take a whole book to do justice to the humanitarian achievements of Denis Halliday, who was a faithful friend to so many people, and especially a faithful friend to the children of Iraq, and to all of humanity. Denis led by example and inspired many others, so he leaves a legacy of humanitarian work that will continue into the future.

May Denis Halliday rest in peace.

— Edward Horgan, Member of the Board of World BEYOND War

Here is a video of a WBW webinar with Denis Halliday:

Notice of death from this website:

Denis J. Halliday, son of the late Stanley and Kathleen of Terenure, Dublin 6 and Errislannan, Co. Galway, brother of the late Leo, died peacefully in the presence of his family on 11th October 2026.

Deeply loved and treasured by Fransisca, Keaton and Lena, Leo and Eileen, Orla, Niamh and Vincent, Paul, Aiden, Jasmine and Nichole.

Lovingly cherished by his extended family and friends, colleagues, his fellow Friends and many more around the world.

Remembered always for the courage of his convictions, his integrity and kindness. A sane voice in an insane world, and one needed now more than ever. A rare man who stood for what was right, even at personal cost.

With Denis’s departure, our consciences are quietened, yet awakened. May we keep a part of his voice alive in our own by speaking out when others stay silent.

Denis began a life of service as a Friends (Quaker) volunteer in Kenya, followed by 34 years with the United Nations, where he rose to Assistant Secretary-General and served as Humanitarian Coordinator in Iraq. His resignation in 1998, in protest of the Iraqi sanctions, marked not an end but a new chapter. Denis continued to devote himself to peace and human rights. His work was recognised with the Gandhi International Peace Award in 2003.

Denis was not only a voice for peace but an active participant, he sailed in 2010 on the MV Rachel Corrie, the Irish aid ship that sought to break the blockade of Gaza.

At home in Ireland Denis was a steadfast advocate of Irish neutrality, opposing the use of Shannon Airport by US military aircraft. He lent his voice to countless other causes, and through it all, his commitment to humanity and accountability never wavered.

Denis will be remembered at Churchtown Friend’s Meeting House, Religious Society of Friends, Dublin 14, D14 F620 on Tuesday (20th October) from 10.30am to 11.30am followed by private burial.

Family flowers only please. Donations, if desired, to Barnardos or the NSPCA.

Due to limited parking in the area, public transport is recommended to reach the Meeting House. Luas stop, Windy Arbour, located 200 metres away.