Victims of the Holocaust are being remembered at religious gatherings and at other events around the world today.
This is the third International Day of Commemoration in Memory of the Victims of the Holocaust since the UN passed a resolution setting 27 January as the official date for remembrance.
The central ceremony will be held at Auschwitz, the largest of the German concentration camps, where at least one million European Jews were killed in its gas chambers during Hitler's reign.
Minister for Justice Brian Lenihan will this evening address the National Holocaust Memorial Service which is being held at the Mansion House.
Speaking ahead of the service, Chief Rabbi Dr Yaakov Pearlman said that as very few living witnesses of the Holocaust remain, the Jewish community is faced with the challenge of ensuring those who perished are not forgotten.
Rabbi Pearlman said everyone must rededicate themselves to ensure what happened during World War II is never allowed happen again.
A survivor's story
One Holocaust survivor, Eva Clarke, has been speaking to a group in Enniskillen about her memories.
Her father Bernd Nathan was shot dead at Auschwitz.
Her mother Anka Bergman was also imprisoned at Auschwitz then transferred to another concentration camp at Mauthausen in Austria. There she gave birth to Eva three days before it was liberated by US forces in May 1945.
Ms Clarke now works for the UK Holocaust Educational Trust and has been visiting schools and other groups in Northern Ireland during the past week to share her story.
