Giannis Antetokounmpo is a Greek professional basketball player for the Milwaukee Bucks of the National Basketball Association (NBA). Nicknamed the "Greek Freak" due to his athleticism, he primarily plays forward, but is also capable of playing guard with his ball-handling skills. During the 2015–16 season, he became the Bucks' primary playmaker. In 2016–17, he led the Bucks in all five major statistical categories and became the first player in NBA history to finish a regular season in the top 20 in total points, rebounds, assists, steals, and blocks. He is of Nigerian descent.

Antetokounmpo grew up in the Athens neighborhood of Sepolia. The New York Times reported: "Like many other immigrants to Greece, his parents struggled to find work. Antetokounmpo and his older brother, Thanasis, helped out by hawking items such as watches, bags and sunglasses." In 2007, Antetokounmpo started playing basketball and by 2009 was playing competitively for the youth squad of Filathlitikos.

In 2012, Antetokounmpo joined the senior squad of Filathlitikos and played for them in Greece's second-tier basketball league, the Greek A2 League, during the 2012–13 season.

In December 2012, just days after turning 18, Antetokounmpo signed a four-year deal with Spanish club CAI Zaragoza, reportedly including NBA buyouts after each season. A number of other major European clubs had been interested in adding him as well, including Barcelona and Efes, among others. With the contract starting with the 2013–14 season, he decided to stay with the Filathlitikos for the remainder of the 2012–13 season.

During the 2012–13 Greek A2 League season, Antetokounmpo shot 46.4% from the field (62.1% on two-point field goals), 31.3% from three-point range, and 72.0% from the free throw line, while averaging 22.5 minutes per game. Over 26 games, he averaged 9.5 points, 5.0 rebounds, 1.4 assists, and 1.0 blocks per game. He was also selected by the coaches as a special participant in the 2013 Greek League All-Star Game. Even though he was not actually selected as an all-star, the coaches let him play in the game as a treat for the fans.

On April 28, 2013, Antetokounmpo officially made himself eligible for the 2013 NBA draft. He fulfilled his draft projections as a first-round pick by being selected 15th overall by the Milwaukee Bucks. On July 30, 2013, he signed his rookie scale contract with the Bucks.

Antetokounmpo averaged 6.8 points, 4.4 rebounds, 1.9 assists, 0.8 steals, and 0.8 blocks in 77 appearances during his rookie season. He scored in double figures 23 times and grabbed 10+ rebounds twice, with both efforts resulting in double-doubles. He finished the season with 61 total blocks, which led all NBA rookies and was the seventh-most by a Bucks rookie in franchise history. He was selected to participate in the Rising Stars Challenge at NBA All-Star Weekend in New Orleans, where he tallied nine points, two rebounds and two assists in 17 minutes. At the season's end, he was named to the 2013–14 NBA All-Rookie second team.

On October 16, 2014, the Bucks exercised their third-year team option on Antetokounmpo's rookie scale contract, extending the contract through the 2015–16 season. On February 6, 2015, he recorded a then career-high 27 points and 15 rebounds in a loss to the Houston Rockets. Three days later, he was named the Eastern Conference Player of the Week for games played February 2–8, earning player of the week honors for the first time in his career. He later competed in the 2015 NBA Slam Dunk Contest at NBA All-Star Weekend in New York. On March 9, he scored a then career-high 29 points on 11-of-16 shooting in a loss to the New Orleans Pelicans. The Bucks finished the regular season with a 41–41 record, good for sixth in the Eastern Conference. He missed just one game during the 2014–15 season, averaging 12.7 points and 6.7 rebounds in 81 games. In the Bucks' first round playoff match-up with the Chicago Bulls, they were defeated 4 games to 2.

On August 1, 2015, Antetokounmpo played for Team Africa in the 2015 NBA Africa exhibition game, representing Nigeria due to his parents being born there.

On October 26, 2015, the Bucks exercised their fourth-year team option on Antetokounmpo's rookie scale contract, extending the contract through the 2016–17 season. Antetokounmpo improved his scoring to begin the 2015–16 season, averaging 16 points per game over the first 20 games. He also had a high two-point field goal percentage, hovering around 53% from inside the three-point line. On November 19, he scored a then career-high 33 points in a loss to the Cleveland Cavaliers. On December 12, he recorded a near triple-double with 11 points, 12 rebounds and 8 assists, helping the Bucks snap the Golden State Warriors' unbeaten start to the season with a 108–95 win. On January 15, 2016, he recorded 28 points and a career-high 16 rebounds in a 108–101 overtime win over the Atlanta Hawks.

On September 19, 2016, Antetokounmpo agreed to a four-year, $100 million contract extension with the Bucks. In the Bucks' season opener on October 26, Antetokounmpo scored a game-high 31 points in a 107–96 loss to the Charlotte Hornets. On November 21, he recorded his sixth career triple-double with 21 points, 10 rebounds, 10 assists, five steals, and three blocks in a 93–89 win over the Orlando Magic. On November 29, he tied a career high with 34 points and added 12 rebounds, five assists, five steals and two blocks in a 118–101 win over the Cleveland Cavaliers. On December 5, he was named Eastern Conference Player of the Week for games played Monday, November 28 through Sunday, December 4. Antetokounmpo helped the Bucks to a 3–0 week, averaging 24.3 points (fourth in the East), 10.0 rebounds (tied for fifth in the East), 6.3 assists and a league-leading 3.67 steals. On December 7, he recorded his second triple-double of the season with 15 points, 12 rebounds and 11 assists in a 115–107 win over the Portland Trail Blazers. It was his seventh career triple-double; Kareem Abdul-Jabbar holds the franchise record with eight. On December 23, he had a career-high 39 points, eight rebounds and six assists in a 123–96 win over the Washington Wizards. On December 31, he recorded 35 points, nine rebounds, seven assists and a career-high seven blocks in a 116–96 win over the Chicago Bulls. On January 4, 2017, he recorded 27 points and 13 rebounds and made a turnaround jumper at the buzzer to give the Bucks a 105–104 victory over the New York Knicks. With 25 points against the Knicks on January 6, Antetokounmpo had at least 20 points in his 14th consecutive game, matching the longest streak by a Bucks player since Michael Redd in 2006. On January 19, Antetokounmpo was named a starter on the Eastern Conference All-Star team for the 2017 NBA All-Star Game.

Antetokounmpo represented Greece for the first time in July 2013 with the Greek Under-20 national team at the 2013 FIBA Europe Under-20 Championship. He helped Greece to an 8–2 record and a fifth place overall finish, while averaging 8.0 points, 7.6 rebounds, and 2.2 assists across the 10 games. He finished the tournament ranked second in defensive rebounds (7.0) and seventh in blocked shots (1.4).

In 2014, Antetokounmpo played for the senior men's Greek national basketball team for the first time, helping Greece finish ninth overall in the 2014 FIBA Basketball World Cup with a 5–1 record. He averaged 6.3 points and 4.3 rebounds across the six games, while shooting 45.8% from the field.

Antetokounmpo again joined the Greek national team for EuroBasket 2015. Greece's roster consisted of many experienced players, most of them previously crowned European champions with their clubs, like Vassilis Spanoulis, Ioannis Bourousis and Nikos Zisis, and Greece was a favorite for a medal, after showing great form in friendly games. At EuroBasket 2015, Greece was unbeaten in the group stages, and reached the quarter-finals, where a tight game ended in favor of the eventual champions, Spain. Antetokounmpo finished the tournament with three double-doubles, and a career-high 17 rebounds against Spain, leading his team in rebounds for the tournament. In eight games, he averaged 9.8 points, 6.9 rebounds and 1.1 assists per game.

Antetokounmpo also played with Greece at the 2016 Turin FIBA World Olympic Qualifying Tournament, where he averaged 15.3 points, 5.7 rebounds, 2.0 assists, 0.7 steals, and 2.0 blocks per game in 3 games played. Greece failed to qualify for the 2016 Summer Olympics, after being eliminated by Croatia, by a score of 66–61.

He officially gained Greek citizenship on May 9, 2013, with the official romanization of his name being Giannis Antetokounmpo. His nickname is the "Greek Freak".

Antetokounmpo's father, Charles, was a former Nigerian football player, while his mother, Veronica, is a former high jumper. Charles died in September 2017, at age 54. Veronica gave each of her five sons both Greek and Nigerian names, choosing the Nigerian Ougko (/ˈuːɡoʊ/ OO-goh) for Giannis.

Antetokounmpo has two older brothers, Francis (Greek name Andreas) and Thanasis, as well as two younger brothers, Kostas and Alexis. He and Thanasis were teammates in Filathlitikos, with Kostas later joining the squad in the 2013–14 season. His oldest brother, Francis, has played football professionally in Nigeria, and both basketball and football professionally in Greece. The entire Antetokounmpo family except for Francis and Thanasis moved from Athens to Milwaukee in early 2014. In July 2016, Giannis and Thanasis began their mandatory military service in Greece. The two brothers served a reduced three-month military service, as prescribed for Greek citizens who are permanent overseas residents.

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