Parents and adults

Parents and adults

• Jack Bolton is Troy Bolton's father and the coach of the East High boys' varsity basketball team. He is angry when he finds out that Troy auditioned for the school musical weeks before the district championship game in. He voices his disapproval but changes his mind when he sees how talented Troy is. When Troy begins working at the Lava Springs country club, Jack advises Troy to keep his eye on college. Jack is once again angry with Troy when he learns Troy is considering other schools besides the University of Albuquerque; however, he comes to terms with Troy's decision to enroll at the University of California, Berkeley. Coach Bolton is played by Bart Johnson in the first three films of the series.
• Ms. Darbus is the overly-dramatic musical director at East High. Her classroom serves as homeroom for Troy Bolton, Gabriella Montez, Sharpay Evans, Ryan Evans, Chad Danforth, Taylor McKessie, Kelsi Nielsen, and other students. She has an intense dislike of cell phones, particularly when they ring in the theater. She and coworked Coach Jack Bolton do not always see eye-to-eye. In the first film, Ms. Darbus is convinced that Troy and Gabriella only auditioned for the musical to mock it. In the end, she casts them as the leads. In High School Musical 3: Senior Year, Ms. Darbus submits Troy's name for a scholarship to the Juilliard School without his knowledge. Ms. Darbus is portrayed by Alyson Reed in the films.
• Lisa Montez is the single mother of Gabriella Montez. Gabriella has stated that she and her mother relocated several times. They move to Albuquerque halfway through Gabriella's junior year, and she promises Gabriella that it is a permanent arrangement until she graduates. Lisa is very proud of Gabriella for being accepted to Stanford University and does not agree with her daughter when she suggests taking a year off after high school. As Gabriella's graduation approaches, Lisa puts the house up for sale. It is unclear what happened to her husband; he has only been mentioned once, by Gabriella as she recollects her childhood, and is presumably dead. Lisa is portrayed by Socorro Herrera in the first and third films.
• Vance Evans is the wealthy father of Sharpay and Ryan Evans and the owner of the Lava Springs country club. He holds the highest record on the club's golf course, which he built himself. His alma mater is the University of Albuquerque. He is very impressed by Troy Bolton and offers him opportunities through his connections with the university. Vance is portrayed by Robert Curtis Brown in the second and third films.
• Darby Evans is the wealthy mother of Sharpay and Ryan Evans and the wife of Vance Evans. She approves the hiring of several East High students to the Lava Springs country club, much to the dismay of Sharpay, who only wanted Troy Bolton to work there. She is very interested in yoga, has a unique relationship with both students, and is unskilled at golf. She is portrayed by Jessica Tuck in the second and third films.
• Thomas Fulton is the manager of the Lava Springs country club. He is obligated to take Sharpay Evans' orders. In doing so, he hires Troy Bolton to work at the club. He is uptight and prefers structure and discipline. He is portrayed by Mark L. Taylor in High School Musical 2.
• Dave Matsui is the principal of East High. He is first seen welcoming Gabriella Montez to East High. He also seems to have to deal with the quarrels between Coach Jack Bolton and Ms. Darbus. He insists that they need to learn to work together, although he seems to have more interest in Coach Bolton's side of the argument. Principal Matsui is portrayed by Joey Miyashima in High School Musical and High School Musical 3: Senior Year.
• Lucille Bolton is Troy Bolton's mother and Jack Bolton's wife. She is depicted as being somewhat annoyed with Troy and Jack's extreme dedication to basketball. Lucille is portrayed by Leslie Wing in the first three installments of the series.
• Charlie Danforth is the father of Chad Danforth and friend of Jack Bolton. He is portrayed by Corbin Bleu's real-life father, David Reivers in the third film. His unnamed wife is portrayed by Yolanda Wood in the third film.
• An unnamed chemistry teacher at East High. She is portrayed by Irene Santiago-Baron.
• Ms. Falstaff is a librarian at East High. In the first film, she constantly reminds Chad to keep quiet in the library. She is portrayed by Joyce Cohen.

Others

• Jackie, Lea, and Emma are Sharpay Evans' friends, sometimes called the "Sharpettes". The girls are sometimes collectively known as the Sharpettes, as they often act as back-up singers and dancers for Sharpay, but are never referred to as such in the film series. It is apparent that they do not attend East High School and spend the majority of their time with Sharpay during the summer at her family's country club, Lava Springs. They seem to be equally as pampered as Sharpay, but always follow her every order. Jackie, Lea, and Emma are only portrayed in High School Musical 2, by Tanya Chisholm, Kelli Baker, and McCall Clark, respectively. Baker had a role as a cheerleader and dancer in the first film.
• Boi is Sharpay's dog who appears in High School Musical 2, High School Musical 3: Senior Year and Sharpay's Fabulous Adventure, Boi is taken to New York with Sharpay. He is given an opportunity to participate in a play called "A Girl's Best Friend" on Broadway, which Sharpay initially believed was her opportunity until the casting agent clarified her mistake. Boi meets another dog called Countess and they fall in love with each other, but their owners initially fail to see their affections. He is portrayed by director Kenny Ortega's dog, Manly "Little Pickles" Ortega.
• Countess is Roger Elliston's well-trained dog who appears in Sharpay's Fabulous Adventure. Countess meets another dog called Boi and they fall in love with each other, but their owners initially fail to see their affections.
• Lupe, Tiffany and Dena are Sharpay's friends in Sharpay's Fabulous Adventure who help her to show her father that she's determined to take an offer for Broadway. They are portrayed by Alessandra Cannito, Lauren Collins and Shadia Ali, respectively.
• Jerry Taylor is a famous Broadway producer who offers Sharpay's dog, Boi, the chance to star in his latest show. He is portrayed by Pat Mastroianni in Sharpay's Fabulous Adventure.
• Gill Samms is a producer of Jerry's show. He is portrayed by Alec Mapa in Sharpay's Fabulous Adventure.
• Neal Roberts is another producer of Jerry's show. He is portrayed by Jack Plotnick in Sharpay's Fabulous Adventure.