Buffalo Grove supports 47 student clubs and activities, an entire and updated list of which can be found at the school's website. These include music, the arts, culture and language, social/political action, and student government. Buffalo Grove also has a nationally recognized Speech and Debate team, boasting the 99th best Lincoln Douglas Debate team in the National Forensics League. Among the clubs are chapters of these more nationally notable groups:
NJROTC, SADD,
Scholastic Bowl,
Science Olympiad (which won the Illinois State Championship in 1989, 1990 and 2024), and
Mathletes. In March 2012, the Scholastic Bowl Team qualified for the IHSA State Meet in Peoria, Illinois by beating William Fremd High School in the Sectional Final at North Chicago High School. They were also the Regional Champions and MSL Conference Champions, beating Fremd in dramatic fashion 485-480. Another prominent group at Buffalo Grove was its
show choir, The Expressions. This mixed competition show choir was composed of 38 singer-dancers, 12 band members and 4 crew members. Similar to the hit television show
Glee, the group met as a class and competed throughout the country at various show choir competitions. They attended the Dekalb Indiana Show Choir Invitational Competition, the Chicagoland Showcase Competition, and the Nashville Show Choir Nationals Competition. ==Notable alumni==