A new oxyfluoride Sr 2Mn 2O 5- xF 1+ x was synthesized by low temperature fluorination of Sr 2Mn 2O 5 with XeF 2 and studied using X-ray powder diffraction, electron diffraction and high resolution electron microscopy. The oxyfluoride has a tetragonal perovskite-like structure with cell parameters a=3.8069(8) Å, c=3.989(2) Å (S.G. P4/mmm). No additional superstructure or lattice distortions were detected by electron microscopy. The Mn oxidation state was evaluated using bond valence sum calculations as close to VMn=+3.5. The tetragonal distortion of the perovskite structure arises from the Jahn-Teller deformation of the Mn(O,F) 6 octahedra.