Abo may refer to:
Abortion is the ending of pregnancy by removing a fetus or embryo before it can survive outside the uterus.
The ABO blood group system is the most important blood type system (or blood group system) in human blood transfusion.
Aboriginal Australians are legally defined as people who are members "of the Aboriginal race of Australia" (indigenous to the Australian continent—mainland Australia or to the island of Tasmania).
The Aboriginal Tasmanians (Tasmanian: Palawa) are the indigenous people of the Australian state of Tasmania, located south of the mainland.
Abortion in the United States has been and remains one of the most controversial issues in United States culture and politics.
Abolitionism is a movement to end slavery, whether formal or informal. In Western Europe and the Americas, abolitionism is a historical movement to end the African and Indian slave trade and set slaves free.
Aboriginal peoples in Canada, or Aboriginal Canadians, (also known as Indigenous peoples in Canada and Indigenous Canadians) are the indigenous peoples within the boundaries of present-day Canada.
Aboriginal title is a common law doctrine that the land rights of indigenous peoples to customary tenure persist after the assumption of sovereignty under settler colonialism.
Abolitionism in the United States was the movement before and during the American Civil War to end slavery in the United States.