The Lexicon entries below explore significant Holocaust-related events, topics, places and personalities and are based on Yad Vashem's Encyclopedia of the Holocaust.
- AB-Aktion
- Abetz, Otto
- Abwehr
- Action Francaise
- Adamowicz, Irena
- Ahnenerbe
- Aktion 1005
- Aktion Reinhard
- Albania
- Algeria
- Aliya Bet
- Alsace-Lorraine
- Althammer
- Amelot
- American Friends Service Committee
- American Jewish Conference
- American Jewry and the Holocaust
- American Zionist Emergency Council
- Anielewicz, Mordecai
- Anschluss
- Anti-Jewish Legislation
- Antisemitism
- Antisemitism - Working Definition
- Antonescu, Ion
- Antonescu, Mihai
- Antwerp
- Arendt Controversy
- Arrow Cross Party
- Art of the Holocaust
- Aryan Paragraph
- Aryanization
- Asscher, Abraham
- Association of Jews in Belgium
- Athens
- Atlas, Yeheskel
- Auerswald, Heinz
- Auschwitz Protocols
- Auschwitz, Bombing of
- Auschwitz-Birkenau
- Australia, Jewish Refugees in
- Austria
- Autonomous Refugee Aid Committee, Romania
- Axis