Washington Mystics, American professional basketball team based in Washington, D.C., that plays in the Eastern Conference of the Women’s National Basketball Association (WNBA). The team has won one WNBA championship (2019).

The Mystics began play as an expansion team in 1998, one year after the WNBA made its debut as a league. The name Mystics evoked the team’s counterpart in the National Basketball Association, the Washington Wizards. (Both franchises were owned by businessman Abe Pollin.) In the Mystics’ first season, the team compiled a league-worst 3–27 record. With the first overall pick in the 1999 draft, however, the Mystics selected University of Tennessee forward Chamique Holdsclaw, the Naismith College Player of the Year in 1998 and 1999. Holdsclaw had an immediate positive impact on the Mystics, helping the team improve its record over the next two seasons and earn its first playoff berth, in 2000. In 2002 the Mystics advanced to the Eastern Conference finals, where they were defeated by the New York Liberty.

In 2005 Pollin sold the Mystics to an ownership group that included Sheila C. Johnson, a cofounder of the cable television network Black Entertainment Television (BET). Johnson was the first Black woman to become an owner of a WNBA team. In 2006 the team went 18–16 and reached the Eastern Conference semifinals before losing to the Connecticut Sun. Despite posting a losing record (16–18) in 2009, the Mystics returned to the Eastern Conference semifinals that year behind the stellar play of forward-centre Crystal Langhorne, but the team was eliminated by the Indiana Fever. The following year the Mystics improved to 22–12, tying the Liberty for best record in the Eastern Conference. Again, however, they were stopped in the conference semifinals, losing to the Atlanta Dream.

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Mike Thibault was hired as head coach of the Mystics in 2013. Over the next seven seasons, the team missed the playoffs only once, in 2016. Ahead of the 2017 season, the Mystics acquired 6-foot, 5-inch (1.96-metre) forward-guard Elena Delle Donne, winner of the league’s 2015 Most Valuable Player (MVP) award. In 2018 Delle Donne led the Mystics to the WNBA finals, where the team was swept by the Seattle Storm in three games. In 2019, however, the Mystics topped the league with a 26–8 record and captured their first championship, defeating the Sun three games to two in the finals. Delle Donne opted to sit out the 2020 season (shortened to 22 games because of the COVID-19 pandemic), and the Mystics went 9–13 before a loss in the first round of the playoffs. The Mystics missed the playoffs in 2021, but, after a 22–14 season in 2022, they returned, only to lose to the Storm in the first round.