|Location||Grayslake, Illinois, USA|
|Colors||Green and White|
|Mascot||Guido the Ram|
|Website||Official School Website|
Grayslake Central, originally known as Grayslake Community High School, was built in 1949 on Lake Street. It was originally fairly small but has since expanded over the years and now includes approximately 1,400 students. The school's mascot has for years been "Guido" the Ram. Grayslake Community High School was renamed Grayslake Central in 2004 when Grayslake North High School was built. The school's athletic department participates in the Fox Division of the Fox Valley Conference.
Grayslake Central and Grayslake North have developed a town rivalry. This is celebrated every year with Central vs. North athletic events within the FVC Fox Division. The Grayslake North/Grayslake Central football game is called "The Kick-off Classic". The Fall of 2006 was the first year that the varsity teams were able to compete, with Central winning 33-10. In 2007 North beat Central, 31-6. The next year, Grayslake Central beat Grayslake North 33-21. In 2009, the first year in which both teams entered with a win, Central posted the first shutout in the series history in a 28-0 victory.
Grayslake Central's music program placed second in state in the Illinois High School Association in 2006. The school offers many teams and clubs students can participate in; the math team placed 4th in state 2007 in calculator team. Also, the school's debate team has been growing steadily. The school's science olympiad, led by senior Michael Reed, placed 1st in single A division in state in 2008, and the math team's calculator team, captained by Michael Petro, placed 2nd in state tied with rival Grayslake North. Its music program placed 4th in state in 2008, as it was their first year after the complete split between Central's and North's music programs.
Central's baseball program won regional and sectional titles in the spring of 2006, also finishing third in the state playoffs in 2009.
The basketball program won a regional titles in 2008 and 2009.
The varsity golf team placed 10th in state for the 2A level in 2009.
The Grayslake Lacrosse Team previously coached by Howard Kravits, won the Division B State Championship in 2004, and placed 2nd in 2007 at the Division B State Championship, losing to Fenwick High School. In March 2009 the Grayslake Central Varsity Poms squad placed 5th at state in the Bradley Staduim. They tied with the highest placement in the history of Grayslake Poms (they also placed 5th in 2007)
Every April, the Grayslake Central environmental club host a benefit concert in the school's gym. Usually a large number of local garage bands play as the main entertainment, but these are usually augmented with inflatable structures.
GCHS has been the center of number of Sexual Assault incidents, including:
In 2007, Klint Wescom, one of the Grayslake Central track coach, was charged with criminal sexual assault and criminal sexual abuse against a 17 year old student. The student was one of Wescom's track and field runners.
Jason Glick, 37, faces up to five years in prison if convicted of any of six counts of aggravated criminal sexual abuse lodged against him.