1. Batswana: This group is the largest, and includes the tribes of Tswana, Kgalagadi, Tawana, and others.
2. Bakalanga: This group is concentrated in the northern and eastern parts of the country and includes the tribes of Kalanga, Shona, and others.
3. San (Basarwa): The San people are indigenous people of Botswana who lived in the country before the arrival of the Bantu-speaking tribes. They are also referred to as Bushmen.
4. Herero: The Herero people are a Bantu-speaking group who migrated from South-West Africa (now Namibia) to Botswana in the late 19th century.
Please note that these ethnic groups are further divided into numerous tribes and subgroups.