X-ray powder diffraction data for piperaquine, C29H32Cl2N6, are reported [a = 15.8865(1) Å, b = 12.5975(3) Å, c = 13.2647(3) Å, β = 91.2890(1)°, unit-cell volume V = 2654.02 Å3, Z = 4, and space group P21/n]. All measured lines were indexed and are consistent with the P21/n space group. No detectable impurities were observed.