Michael Weinstein (born June 26, 1960 Lausanne, Switzerland) is a composer, theorist, hornist, and educator.

A BMI registered composer, Michael H. Weinstein has written over fifty works in the concert music field and his catalogue includes pieces for symphony orchestra, wind ensemble, brass ensemble, choral and solo vocal works, chamber works, and solo instrumental pieces.  He is particularly committed to writing music for wind instruments and has received some of his most important commissions and performances in that genre. His music is published by Boosey & Hawkes and Micha Music.

Since April 2001, he has been the chair of the music department at the Cambridge School of Weston where he conducts the choir and chamber orchestra, coaches chamber music, leads the Contemporary Ensemble, and teaches courses in music history, theory and composition. He is an Assistant Professor of Composition at the Berklee College of Music where he teaches traditional harmony and counterpoint, computer notation, and contemporary techniques.  He is also on the faculty of the New England Conservatory Preparatory Division in the Theory Department. He was a visiting Assistant Professor of Music Theory at Brandeis University for the 2010-11 academic year. Past positions include teaching appointments at the Boston Conservatory, Wheelock College, the Walnut Hill School for the Arts, and the Milton Academy.