Diman Regional Vocational Technical High School is a public vocational high school located in Fall River, Massachusetts. The high school serves a regional school district comprising the city of Fall River, and the surrounding towns of Somerset, Swansea and Westport. The school has an enrollment of over 1,400 students and offers vocational-technical education in 18 different programs.

The school also includes the Diman Regional School of Practical Nursing, offering post-graduate education in the field of practical nursing.

Diman received national attention in January 2018, when then-United States Representative Joe Kennedy III gave the Democratic Party's response to Donald Trump’s 2018 State of the Union Address from the school’s automotive shop. Massachusetts’s 4th congressional district, which Kennedy represented at the time, includes the school.