Hilo High School is a public, co-educational high school of the Hawaii State Department of Education, and serves grades nine through twelve. Established in 1906, its first class graduated in 1909. Hilo High School is near the Wailuku River in Hawaii County on the Big Island of Hawaii, United States. The campus boasts the black marble terrazzo and gray gravel sculpture Matrix by Ken Shutt in the middle of its two patios in its courtyard. The school is situated at 556 Waianuenue Avenue on across the street from Hilo Intermediate School, one of its two feeder schools, the other being Kalanianaole Intermediate School. Hilo's symbol and mascot is the Viking and its school colors are blue and gold. Hilo High School celebrated its centennial during Homecoming of 2006. Hilo High School's crosstown rivals are the Warriors of Waiakea High School.

Hilo High School was started by the school authorities in September 1905. The idea for a high school is attributed to Josephine Deyo, principal of Hilo Union School. The weak public interest eventually grew stronger as the public realized the benefits from a high school in Hilo, Hawaii. At the time, the only High Schools on the island were Kau High and Pahala Elementary School and Honokaa High & Intermediate School, both over 30 miles away in rural sugar communities that were disconnected from most of the island and were only accessible by railroad. Most students who wished to attend high school went to boarding school in Honolulu, Hawaii.

The school changed location in 1907 to the District Annex location and was then named Hilo Junior High School, and moved yet again in 1922 to its present location on Waianuenue Avenue.

• 1922 - First Building- Makai Building
• 1926 - Miss Margaret Way's music class created the Hilo High Alma mater
• 1927 - Auditorium Building donated by the Alumni Association.
• 1931 and 1934 -Cafeteria built (Now known as F building)
• 1935 - First stage of the Mauka Building built
• 1936 - Second stage of the Mauka Building built
• 1939 - Third stage of the Mauka Building built
• 1937 - Original gym and wood shop built
• 1961 - Administration Building Built
• 1962 - Swimming Pool donated by Mrs. John M Ross and Mrs. Isabel Kennedy
• 1963 - The Library and Multi Purpose Room was built
• 1968 - The Cafeteria was built
• 1970 - R-Building
• 1977 - Mauka Building burns down
• 1979 - 100-car parking lot built
• 1980 - C Building built
• 2014 - New Gym built at the old annex location.

The Hilo High School Foundation was formed in 1990, with the purpose of creating and maintaining an endowment fund that would fund educational programs and activities at Hilo High School that would not or could not be funded from State of Hawaii funds. It annually provides the school with the interest earnings for distribution to programs. A committee designated by the Principal solicits and reviews proposals from faculty for new and innovative programs that benefit the educational experience of Hilo High School students.

To date, the Foundation has distributed a total of over $130,000 to Hilo High School. Its 2005 Financial Report place its assets at $724,063.44.

Hilo High School's commencement exercises are normally held during the end of May.

Hilo High school has several commencement traditions that stretch back to the school's first graduation in 1909. The graduating class recites a variation of Gaudeamus Igitur with lyrics directly referencing Hilo High, and members of the Hilo High School Alumni Association pass out a lei to every graduate. This latter tradition is attributed to the patriarch of the Tong family, who was among the school's first graduates and supposedly gave a lei to a fellow graduate who was without one during their commencement ceremony. The Tong family also awarded the school's Salutatorian award and trophy with a cash prize until 2003, when the Salutatorian returned the cash prize out of respect for the family's disagreement with the school's current practice of awarding the Valedictorian distinction to more than one student. The Valedictorian trophy is maintained by the Hilo High School Foundation.

Now, with the introduction of AP classes to Hilo High, it is possible for more than one student to become a valedictorian within the same graduating class since AP classes allow the student to get over a 4.0. The current requirements for becoming a valedictorian include getting the distinguished BOE diploma as well as getting a weighted GPA of at least 4.0.

Hilo High supports an array of clubs that promotes and supports the talents, knowledge, ambitions and abilities of the students. The clubs also train and prepare students for future professional careers, and allows the school and students to give back to the community through community service events.

• DECA
• Key Club
• KVIKS Media
• Leo Club
• Math League
• Performing Arts Learning Center (PALC)
• Robotics

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (June 2022)

• James Kealoha (1926), first lieutenant governor of Hawaii
• Pat Saiki (1948), United States Congresswoman
• Yoshi Oyakawa (1951), Olympic swimming gold medalist in the 1952 Summer Olympics
• Gil Kahele (1960), American politician and Democratic member of the Hawaii Senate
• Robert Kiyosaki (1965), author of Rich Dad, Poor Dad
• Jennifer Doudna (1981), American biochemist, developer of the CRISPR-Cas9 genome editing method, 2020 Nobel laureate
• Lorraine Inouye, Hawaii County Mayor and State Senator
• Sonny Tanabe (1953), All America High School swimmer for Hilo High and Olympic swimmer in the 4x200 meter freestyle relay at the 1956 Summer Olympics
• Lois-Ann Yamanaka (1979), author
• B.J. Penn (1995), retired MMA Fighter former UFC Lightweight and Welterweight Champion and UFC Hall of Fame Member
• Maui Ahuna (2020) Current baseball player for the San Francisco Giants

• 
  Main Office
• 
  The School Gym

• Official website
• Hilo High School Foundation
• Hilo High Robotics Official Website

19°43′16″N 155°05′46″W / 19.72102°N 155.09608°W / 19.72102; -155.09608