Cyclophilin A from the bovine parasite Trypanosoma brucei brucei has been cloned, expressed in Escherichia coli, purified and crystallized in the presence of cyclosporin A using ammonium sulfate as a precipitant. The crystals belong to the orthorhombic crystal system with unit-cell dimensions of a = 118.61, b = 210.15 and c = 153.21 A. A data set complete to 2.7 A has been collected using rotating-anode radiation, however the crystals diffract to at least 2.1 A resolution using synchrotron radiation.