Alexandros Emeka Antetokounmpo (/ˌɑːntɛtəˈkuːmpoʊ/ AHN-tet-ə-KOOM-poh; Greek: Αλέξανδρος Εμέκα "Άλεξ" Αντετοκούνμπο, IPA: [aˈleksanðros ˈaleks a(n)detoˈkumbo]; born Adetokunbo 27 August 2001) is a Greek-Nigerian professional basketball player for M Basket-Delamode Mažeikiai of the Lithuanian Basketball League (LKL). He is the youngest brother of basketball players Giannis, Thanasis, and Kostas.

Antetokounmpo was born in Sepolia, a neighbourhood in Athens, Greece. He is the son of Nigerian parents, Veronica and Charles Antetokounmpo. He has a Nigerian passport, which was granted to him in June 2013, so that he could gain a visa, and be allowed to legally enter into the United States.^[1] He received the Greek citizenship in September 2021, alongside his mother.^[2] He started playing basketball at age nine,^[3] and in sixth grade, moved with his family to Cudahy, Wisconsin, near where his older brother Giannis was practicing for his rookie season for the Milwaukee Bucks of the (NBA) National Basketball Association. Before high school he moved to River Hills, Wisconsin. He attended St. Monica School in Whitefish Bay, Wisconsin.^[4]

Antetokounmpo played basketball for Dominican High School in Whitefish Bay for four years. As a freshman, he averaged 2.9 points per game, and grew about 12 cm (five inches) to 2.03 m (6 ft 8 in) by the time he was a sophomore.^[4] Antetokounmpo was a two-time all-state selection and averaged 20 points and seven rebounds per game as a senior. He received scholarship offers from DePaul, Ohio and Green Bay.^[5] On 9 May 2020, Antetokounmpo announced that he would play in Europe after graduating from high school, rather than playing college basketball. He was considered a three-star recruit by major recruiting services.^[6]

Three of his older brothers, Giannis, Thanasis and Kostas, play basketball professionally, and all three have won NBA championships. Giannis was named NBA Most Valuable Player in both 2019 and 2020. Thanasis and Giannis both won the NBA championship in 2021 playing for the Milwaukee Bucks, with Giannis being named as Finals MVP. Kostas last played for the Chicago Bulls & won an NBA title with the Los Angeles Lakers in 2020. Antetokounmpo's father and his oldest brother, Francis, played football in Nigeria. His mother was a high jumper.^[18] In September 2021, Alex along with his mother were granted honorary Greek citizenship from the Prime Minister of Greece, Kyriakos Mitsotakis.^[19] Alex, along with hockey player Filip Forsberg and three of his older brothers, Giannis, Thanasis and Kostas, were announced as joining the Nashville SC ownership group in the MLS.^[20]