Abo may refer to:
Abortion is the ending of pregnancy by removing a fetus or embryo before it can survive outside the uterus.
Aboriginal peoples in Canada, (also known as Indigenous peoples in Canada) are the indigenous peoples within the boundaries of present-day Canada.
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.
The ABO blood group system is the most important blood type system (or blood group system) in human blood transfusion.
The abortion debate is the ongoing controversy surrounding the moral and legal status of induced abortion.
Abortion in the United States has been and remains one of the most controversial issues in United States culture and politics.
The Aboriginal Tasmanians (Tasmanian: Palawa) are the indigenous people of the Australian state of Tasmania, located south of the mainland.
Abolitionism in the United States was the movement before and during the American Civil War to end slavery in the United States.
Aboriginal Australians are legally defined as people who are members "of the Aboriginal race of Australia" (indigenous to mainland Australia or to the island of Tasmania).