Mercer Island High School (MIHS) is a public high school located in Mercer Island, Washington in the U.S., as part of the Mercer Island School District.

As of the 2011-2012 school year, the school had an enrollment of 1,448 students and 67.2 classroom teachers (on an FTE basis), for a student-teacher ratio of 21.7.

During the 2006-07 school year, Mercer Island High School was recognized with the Blue Ribbon School Award of Excellence by the United States Department of Education, the highest award an American school can receive.

Featuring average SAT scores of 635 in math and 613 in verbal, Mercer Island also features the highest Washington Assessment of Student Learning scores statewide. Additionally, more than 95% of graduates pursue higher education.

Class offerings include special education, honors, and AP classes. KMIH 88.9 FM is a student-run radio station and also an educational class at Mercer Island High School.

With regard to the MIHS music program, consisting of the concert bands, the marching band, the jazz bands, and the steel drum bands (conducted by Parker Bixby), over 300 students annually participate—about 25% the MIHS student population. It so is then one of the largest of its sort, and since Anno Domini 1976, under marvellous leadership, such as aforementioned has made itself to be of the best known. In addition to participation with the 2011 London, England New Year’s Day Parade & Festival by royal patronage, the many year exploitation has yielded a number of achievements:

Island High School is a public coeducational high school serving grades 9-12. It is located in Alameda, California and is part of the Alameda Unified School District. Island High only admits students that are at least sixteen years old.

Island High opened as a continuation school in the 1970s as an alternative high school to Alameda and Encinal High Schools. The original campus was located at 2437 Eagle Avenue in Alameda, near both the Park Street and Fruitvale Bridges. In 2007, Island High moved to its present-day location, which is the site of the old George P. Miller Elementary School. The elementary school building was renovated to better suit a High School environment.

Island High is different from most traditional high schools in the State of California with the fact that it allows students to earn 7.5 credits every semester, instead of the usual 5 at a traditional high school. Moreover, the school doesn't give out F grades, instead a "No Mark" is given in lieu of a failing grade. Both grades (F and NM) do not give credit. Students are also given credit through special optional assignments called Contracts, and can earn credits in a class by taking Challenge Exams, which, if passed, apply 5 credits in the exam's subject area, which is worth a semester of credits at a traditional high school.

High school is a term used in parts of the English-speaking world to describe institutions which provide all or part of secondary education, but not always the highest years of basic education, which can be called a "secondary school" or "secondary college" or other terms, depending on the nation or region (see below: Usage by country). The phrase "high school" is often incorporated into the name of the related institutions.

The term (as "high school") originated in Scotland, with the world's oldest being Edinburgh's Royal High School from 1505. The Royal High School was used as a model for the first public high school in the United States, the English High School founded in Boston, Massachusetts in 1821. The precise stage of schooling provided by a high school differs from country to country, and may vary within the same jurisdiction. In all of New Zealand and Malaysia along with parts of Australia, Bangladesh and Canada, high school is synonymous with secondary school, and encompasses the entire secondary stage of education.

Mercer Island is a city in King County, Washington, United States and the name of the island in Lake Washington on which the city sits. The population was 22,699 at the 2010 census.

Located in the Seattle Metropolitan Area, it is the most populated island in a lake within the United States. The ZIP code 98040 is unique to Mercer Island.

Mercer Island, named for the Mercer family of Seattle, was first settled between 1870 and 1880. The Mercer brothers often rowed between the island and Seattle to pick berries, hunt, and fish. Those brothers, Thomas Mercer and Asa Shinn Mercer, are members of the Mercer family of Virginia and are supposed relatives of The Shins frontman, James R Mercer^{[citation needed]}. The first large settlement, East Seattle, was toward the northwest side of the island—near the McGilvara neighbourhood. During 1889, a C C Calkins built a large and gilded resort, the Calkins Hotel. The hotel was patronised via steamboat between: Madison Park, Leschi Park, and the Eastside. Burnt by a mysterious fire, the hotel was razed during 1908.