Spiritual Unity is a studio album by American free jazz saxophonist Albert Ayler. It was recorded on July 10, 1964 in New York City, and features bassist Gary Peacock and drummer Sunny Murray. It was the first album recorded for Bernard Stollman's ESP-Disk label, and it brought Ayler to international attention as it was so "shockingly different". At the same time, it transformed ESP-DISK into "a major source for avant-garde jazz". A 5-star review in AllMusic called it a "landmark recording that's essential to any basic understanding of free jazz", "the album that pushed Albert Ayler to the forefront of jazz's avant-garde... really the first available document of Ayler's music that matched him with a group of truly sympathetic musicians", and stated that "the results are a magnificently pure distillation of his aesthetic."

Free jazz or Free Form in the early- to mid-1970s is a style of avant-garde jazz or an experimental approach to jazz improvisation that developed in the late 1950s and early 1960s when musicians attempted to change or break down jazz conventions, such as regular tempos, tones, and chord changes. Musicians during this period believed that the bebop and modal jazz that had been played before them was too limiting, and became preoccupied with creating something new. The term "free jazz" was drawn from the 1960 Ornette Coleman recording Free Jazz: A Collective Improvisation. Europeans tend to favor the term "free improvisation". Others have used "modern jazz", "creative music", and "art music".