Harmonizers

Harmonizers or harmonizer may refer to:
 * Harmonizer, a type of pitch shifter

Music

 * Harmonize (musician)
 * Harmonizers, a nickname for fans of Fifth Harmony, an American girl group; see List of fandom names
 * The Harmonizer, the official publication of the Barbershop Harmony Society

A cappella groups

 * Alexandria Harmonizers, a choir from Alexandria, Virginia, United States
 * The Four Harmonizers, a barbershop quartet from Chicago, Illinois, United States
 * Homestead Harmonizers, a barbershop choir from Beatrice, Nebraska, United States
 * The Spiritual Harmonizers, a gospel group from Richmond, Virginia, United States

Albums

 * Harmonizer (Apoptygma Berzerk album), 2002
 * Harmonizer (Ty Segall album), 2021
 * I'll Sing You a Song and Harmonize Too