Since the early 1930s, Leander has had a presence in Texas high school football. Since 1942, it has had 17 playoff appearances. The 1942 season was the first time that Leander made an appearance in the playoffs after being named district champions. They were eliminated after losing to Marble Falls 0-26. In 1955, Leander went 8-1-1 in the regular season, falling only to Thrall High School. They entered bi-district, but fell to Troy High School 0-12. In 1959, Leander went 4-5-1, before advancing to the bi-district game against Johnson City High; they fell 6-8. The Lions made their fourth playoff appearance in 1967. They went 8-2, advancing to the playoffs after losing only to Salado and Thorndale. In the bi-district game, they again fell to Salado with a score of 28-14. With their best season since the team's founding, the 1969 Lions went 9-1 in the regular season. They advanced to bi-district and played Mart High School, but fell 0-37. After 27 years without making it to the playoffs, Leander returned to a bi-district game in 1996 with a record of 7-2-1. They were knocked out of the playoffs after a 0-14 loss to Killeen Ellison. In 2001, the Lions made it to the bi-district game against Killeen, but lost 3-21. The 2002 season was the first time Leander won a playoff game after beating Copperas Cove 45-27 in the bi-district game. They advanced to area playoffs, but lost to Spring High School 26-28. In 2003, Leander hired head coach Steve Gideon. Though he would coach the football team for the next eight years, the 2003 season was his best. During the regular season, Leander went 9-1, and were able to advance to playoffs. Leander first beat Belton 14-13 in the bi-district game, before advancing to the area game against Cypress Springs, who they topped 31-7. Leander then faced Dallas Carter and beat them 11-9. For their final playoff game of the season, Leander faced Allen High School in the state 5A quarterfinals. Allen held a constant lead throughout the game, and Leander was defeated 49-35. After failing to make the playoffs in 2004, the 2005 team went 9-1 and were named district champions. They played Bastrop in the bi-district game, and advanced to area after beating the Bears 39-13. They appeared in the area game against the undefeated Copperas Cove team, and were defeated 42-28. In 2006, Leander was named district champion and made it to the bi-district game against Ellison. They beat the Eagles 49-22, then moved to the area game against Klein Forest who they beat 35-24. Leander played Garland in the regional game, but were defeated 24-27.
Basketball
Currently, Leander has four basketball teams: Varsity, Junior Varsity, 9th A, and 9th B. In 2013, Coach Clint Bradley won the award Coach of the Year.
Baseball
Leander has three baseball teams: Varsity, JV Blue and JV Red. The teams are coached by head baseball coach Matt Grissom.
Fine arts
Band
Choir
Dance
Theatre
Band
The Leander High School Band's recent accolades include:
The Leander High School robotics team has won many different awards over the years. Students of any background may join, even if they have no knowledge of robotics.