Well-ordered, vertically aligned Mn-doped BaTiO3 nanotube arrays (BMn(x)TNTA) were prepared by hydrothermal method using anodized TiO2 nanotube arrays as template. We report the suitability of such band-engineered BaTiO3 for visible light photocatalytic application. Photocatalytic studies demonstrated that BMn(x)TNTA exhibit enhanced visible light photocatalytic degradation of Methylene blue (MB) when compared to unsubstituted BaTiO3 nanotube array (BTNTA). Results obtained from UV-visible spectroscopic, X-ray photoelectron spectroscopic (XPS), photoluminescence spectroscopic (PL) and magnetic studies have been combined to establish the influence of defect chemistry on the enhanced visible light photocatalytic activity of BMn(x)TNTA. (C) 2018 Elsevier B.V. All rights reserved.