- "Welcome to Sunnydale High. There's no running in the halls, no yelling, no gum chewing. Apart from that, there's only one rule. If they move, kill them."
- ―Principal Robin Wood[src]
Sunnydale High School was a public high school located in Sunnydale. It was headed by Principal Robert Flutie up until his death in 1997 and then by Principal Snyder. The original school was destroyed on the class of 1999's Graduation Day in the battle between the Scooby Gang and Mayor Richard Wilkins. It was rebuilt and reopened in 2002 and headed by Principal Robin Wood until it was destroyed yet again, with the rest of Sunnydale in 2003.
CampusSeal of Danzalthar, an ancient seal that can open directly to the Hellmouth, was located.
The front of the school contained a sign that said in Latin "Formatia trans sicere educatorum" ("'Enter all ye who seek knowledge").
Sunnydale High facilities included a library located around the middle of the school over the exact place of the Hellmouth. The library acted as the Scooby Gang's main base of operations and strangely was not often used by the students with the exception of the more studious. Cordelia Chase herself did not enter the library until she needed the gang's help as she claimed that she "had a life". The library has been known to give students the wiggins and when Rupert Giles took the position as librarian, he added many historical volumes and biographies (probably about Demonology and the Occult). After the school's reconstruction, the site of the old library was replaced by the Principal's office and according to former librarian, Giles, it consisted of nothing but computers,
A prominent area was the quad, a large exterior area located at the left of the school with a gate at the end of quad. The quad had benches, palm trees, a water fountain, and a clock tower where the heavily bullied and ignored Jonathan Levinson almost killed himself. Many organized events occurred in the quad, such as the announcement of the Mayfair Queen, pep rallys," and the graduation of the Class of '99.
The school possessed a lounge room contained among the hallways. The lounge had tables, couches and artwork displayed on the walls, where students could sit down, talk and eat lunch in between classes. The Scooby Gang tended hang out in the lounge when not in class or in the library
The school dining facility. In 1998, a poltergeist conjured a large number of snakes at the cafeteria. This resulted in the school being temporarily shutdown and the Sadie Hawkins dance being cancelled. Buffy Summers collapsed in the school cafeteria due to the amount of thoughts that plagued her mind when she had Telepathy, where in that moment she heard a thought of someone who wanted to kill all the students, only to discover it was of the Lunch Lady who tried to kill Xander Harris with a butcher in the cafeteria after he found her pouring rat poison in the student's lunch. Buffy then came to the rescue and overwhelmed the Lunch Lady. The Scooby Gang had their exchange of the Box of Gavrok and Willow Rosenberg with the Mayor at the cafeteria after school hours.
The gymnasium was where indoor sports events were held such as the basket ball matches with other schools. Cheerleading practice and auditions were held in the gym, where in one of these auditions Amber Grove's hands combusted when she was cursed by a witch. When heavy storms occurred, all regular gym classes would be cancelled and students were instead forced to play dodge ball. Self-defense classes where also taught during the full moon after a string of werewolf attacks in 1998.
An outdoor area where football was practised and played with opposing teams from other schools. Rupert Giles and Jenny Calendar attended a football game on their first date. At the same game, Cordelia Chase, a cheerleader, was kidnapped by Daryl EppsWhen the school was rebuilt, Dawn Summers feel in love with R.J. Brooks when she saw him with his magical letterman jacket while he was practicing on the field. 
Pool and Steam Room
The swimming pool located inside the school for the Razorbacks' swim team to practice and compete in. It had a locker room and steam room. The steam room was exclusively for swim team members and was used by Coach Carl Marin to provide the swim team with steroids via aromatherapy. The pool room also lead to a utility room contained a water hole where Marin kept the students who turned into Gill Monsters due to the steroids. The water hole was also connected to the sewers which allowed the Gill Monsters to roam around the school and the rest of Sunnydale. 
The school had an auditorium where the Sunnydale Talent Show was held, including one in 1997 where a demon posing as a student began killing participants and extracting their organs in order to retain human form, ending at his death which occurred just before the talent show commenced. The school's performance of Romeo and Juliet where Andrew Wells released a pack of flying monkeys was probably held here.
The office of Robert Flutie (?-1997), R. Snyder (1997-1999) and Robin Wood (2002-2003). It was the site of Flutie's death at the hands of the pack when they were called to his office and devoured him (the official theory being that he was attacked by wild dogs). When the school was rebuilt, the office was placed where the library use to be, meaning it was directly under the Hellmouth. As a vampire hunter, Wood kept an arsenal of bladed weapons concealed in a cabinet inside his office.
The basement level of the school. In 1998, a tunnel was made in the boiler room that led to the location of the Bezoar who used its offspring, distributed via eggs in Health Class, to possess the student body as well as the faculty, and make them mine underground. This was stopped when Buffy killed the beast. After the rebuilding of the school, a tormented Spike took residence in the basement until he moved out. During the first day of school, Dawn Summers and two other students became trapped in the basement where they were attacked by a group of vengeful manifestations until Xander destroyed the talisman keeping them alive. The Seal of Danthalzar was located in the basement was only discovered when Jonathan Levinson and Andrew Wells dug it up out of the ground before. The seal was a direct entrance to the Hellmouth, containing thousands of Turok-Han vampires, likewise, many attempts were made to open it. Buffy and the Potential Slayers used the seal to enter the Hellmouth and commence the Battle at the Hellmouth.
- Xander: "Something weird is going on. Isn't that our school motto?"
- Buffy: "Pretty much."
- — Buffy and Xander[src]
Despite being on the site of a Hellmouth, most students and faculty continued with their lives, living in ignorance of the supernatural forces that cursed their town. The occurrence of strange events and bizarre deaths were ongoing even though acknowledged, yet forgotten while Principal Snyder came up with flimsy rationalizations, often blaming gang-related PCP.
Death due to supernatural causes were common among both students and teachers. Larry Blaisdell was certain at the start of his senior year that it would be the best football season ever, so long as they can "focus, keep discipline and not have quite as many mysterious deaths",  and the school paper even had it's own obituaries section.  Despite this, the Class of '99 had the lowest mortality rate of any graduating class in the history of Sunnydale, with at least around 30 student deaths (including sirings) over three years.
Apart from that, life on Sunnydale High still continued with their very own "it-girl" group called, the Cordettes, and many school social functions, including basketball, football, cheerleading, swing choir, homecoming dances, and foreign student exchange programs.
- The student James Stanley had an affair with his teacher Grace Newman, When she tried to break it off, an angry James shot her before shooting himself.
- A witch swapped bodies with her daughter, a student, to join the cheerleading squad and cursed several students in the process.
- A She-Mantis killed the science teacher to gain employment so that she could mate.
- A group of bullies became possessed by demonic hyenas and as a result ate Mr. Flutie and the school mascot.
- Moloch the Corruptor was accidentally downloaded into the internet by one of the school computers and had two students killed.
- Sid the Dummy killed the last of Brotherhood of Seven after he killed two students and harvested their organs.
- The nightmares of various students began coming true and wrecked havoc.
- A largely unpopular girl became invisible, injured two students and almost killed a teacher.
- The Hellmouth opened and released a multiple-headed demon before closing after the death of the Master. A large group of students were also killed by vampires the same day.
- Spike and his gang raided the school during parent teacher night. Several vampires, one parent and one teacher died during the ordeal.
- A Tarakan assassin tried to kill Buffy Summers, though only was able to seriously wound Oz.
- A bezoar managed to possess the entire student body and faculty by having its eggs distributed during health class.
- The entire female population, both students and faculty, fell under a love spell that had been cast by Amy Madison.
- The computer teacher Jenny Calendar was killed by Angelus after translating the Ritual of Restoration.
- The school was temporarily shutdown when it became haunted by a poltergeist, who was actually the spirit of James Stanley.
- The swim team started turning into fish-like monsters when the coach drugged them with Soviet experiments.
- Kendra the Slayer was killed by Drusilla in the library.
- A student began taking a special potion which led him into becoming a monster and killing the guidance councilor, his girlfriend and releasing a werewolf out of his cage.
- The student's lockers were forcibly searched for witch-related tools.
- The Hellmouth was once again opened with the Sisterhood of Jhe loose and a group of zombies who attempted to blow the school up.
- Jonathan Levinson attempted to kill himself in the school quad, but was convinced otherwise by Buffy who thought he was going to kill the student body. The lunch lady actually attempted to poison the students with rat poison but this was also prevented by Buffy.
- A trade occurred in the cafeteria where the Mayor offered Willow Rosenberg in exchange for the Box of Garvrok.
- A group of hellhounds were let loose during Senior Prom but were fortunately killed by Buffy who later received an award at that event.
- The school was blown-up at a graduation during a hectic battle between the Mayor and the graduating students.
- A trio of Vahrall Demons attempted to reopen the Hellmouth at the destroyed school by preforming a special ritual.
- After leaving the Initiative, Riley Finn took shelter in the school's remains.
- Shortly after its reopening, three manifestations terrorized Dawn Summers and several other students on their first day.
- A group of students attempted to sacrifice Cassie Newton to the demon Avilas. Even though Buffy managed to stop them, Cassie still died of heart failure.
- A school jock unknowingly made several females fall in love with him, including Buffy the school counselor, because of a mystical jacket.
- Jonathan Levinson was killed by Andrew Wells to open the Seal of Danzalthar.
- Amanda and Dawn were chased by a vampire, which was eventually dealt with along with several Bringers.
- A Turok-Han Vampire was released from the seal with the blood of Spike.
- The demon Lissa nearly released another Turok-Han with the blood of Xander.
- The opening of the seal caused a number of strange occurrences at the school. This was stopped by Andrew's tears.
- The school, left completely abandoned, was destroyed along with the whole town after the battle at the Hellmouth.
Groups and Clubs
- The sports teams, known as the Razorbacks
- The Sunnydale High Sentinel, the school newspaper
- The yearbook committee, a group focused on creating the Sunnydale High Yearbook
- The Scooby Gang, a demon-fighting vigilante group based in the school.
- The Chess Team
As the main high school in Sunnydale, situated over a Hellmouth, many of its alumni, and even its faculty, went on to do great things, or at least become supernaturally empowered.
- Buffy eventually became leader to the Slayers and many-time savior of the world.
- Willow Rosenberg, Amy Madison, and Catherine Madison all became very powerful witches. Willow was responsible both for nearly ending and also saving the world. Amy became significantly involved with the US army. Amy's mother Catherine had become a less powerful witch years beforehand.
- Cordelia Chase went on to become a powerful seer, and later ascended to become a higher Power. Her acting career, however, floundered.
- Harmony Kendall, became a vampire during the battle between the Scooby Gang and Richard Wilkins and later became the star of the reality TV show, Harmony Bites.
- Warren Mears, a genius roboticist, Jonathan Levinson, a powerful sorcerer, and Andrew Wells, a skilled demon-summoner, conspired to conquer the world, but had trouble conquering Sunnydale. Warren found life after death, and continued to hone his abilities while Andrew became an important Watcher. Andrew's brother, Tucker Wells, also an adept summoner, was less successful.
- While developing no special powers of his own, Xander Harris came to lead the Slayer Organization alongside Buffy.
Behind the Scenes
- The real building was Torrance High School, located in southern California. The same location was used in Beverly Hills, 90210.
- The second school was filmed at California State University in Northridge, California.
- It's very likely the school was built sometime after the 1930s as it's shown in "Welcome to the Hellmouth" that the church is located directly beneath the Sunnydale High entrance, meaning it might of been built in place of the church after it sunk into the ground.