Phase One is an album by the Art Ensemble of Chicago recorded in Paris in February 1971 and originally released on the French America label then reissued in the US on Prestige Records the following year. It features Lester Bowie, Joseph Jarman, Roscoe Mitchell, Malachi Favors Maghostut and Don Moye performing two side-long pieces dedicated to John Coltrane and Albert Ayler respectively.