Merrillville High School (MHS) is a public high school in Merrillville, Indiana, United States, for students in grades nine through twelve.

In the 2009–10 school year, it added a Freshman Center Wing to its northeast corner.

The demographics of the 2,182 students enrolled in school year 2019-20 were as follows:[2] The Merrillville Pirates compete in the Duneland Athletic Conference.

The school colors are purple, black and white.

The following IHSAA-sanctioned sports are offered:[4]