- AACR stands for American Association for Cancer Research
- AACR stands for Anglo-American Cataloging Rules
- AACR stands for Australasian Association of Cancer Registries
- AACR stands for Association for the Advancement of Civil Rights (political party; Gibraltar)
- AACR stands for American Association of Clinical Research
- AACR stands for Amicale Anglo Cabrio Rennais (French automotive racing group)
- AACR stands for African Armed Conflicts Resolved
AACR