Alhambra High School (AHS) is a public high school in Alhambra, California established in 1898. It is a part of the Alhambra Unified School District.

The school is located on Second Street, across the street from City Hall and the Police Department, bounded by Second Street, Commonwealth Avenue, Fifth Street, and Main Street. The campus is divided into three parts, by Third and Fourth Streets.

Alhambra High School has been accredited by the Western Association of Schools and Colleges—for the first time in 1965 and most recently in 2024, for a fixed term after each evaluation.

As of January 2015, enrollment at AHS is about 2,700 students, In this ethnically-mixed school district, the high school is one of the three comprehensive high schools. Curriculum offerings encompass Reading for remedial instruction, to Advanced Placement courses in six subjects, including English composition, calculus, environmental science, physics, American government, United States history, world history, art history, Spanish, Chinese, Japanese, and Psychology.

Around 1884, Alhambra citizens saw the need for their own school.

On October 11, 2006, a small explosive device was found on a sidewalk bordering the north end of campus. Hours later, a second similar device was found in a trash can on the south end of campus. The Los Angeles County sheriff's bomb squad safely removed and disabled both items, and the campus was searched.

In early 2007, the school was featured on the third season of Hell's Kitchen. 100 members from the senior class of 2007 were invited to participate. Each chef had to prepare 100 portions of a dish for each of the students. It was one of a select few public high schools in California to be awarded a distinguished Great Schools Rating of 8 out of 10.

The marching band was selected to march in the 2009 Pasadena Tournament of Roses Parade, the first time a band from Alhambra has been in the parade in 40 years. In 2020, they performed again in the Rose Parade, as part of a band including members from Mark Keppel High School and San Gabriel High School.

In April 2005, an article was published by The Moor, the school's biweekly newspaper, titled "Latinos Lag Behind in Academics". It discussed that Hispanic students' test scores have improved, then asked why Asian scores were noticeably higher, postulating that Asian students worked harder in academics than Hispanic students, suggesting the latter were "not pulling their weight". The Los Angeles Times discussed the achievement gap in context, noting the outrage and charges of racism towards the student author and the Latino pride response.

• Alhambra High School website