The aim of this study was to develop a new means to assess residuum/socket interface couplings at different speeds and walking over different terrains using motion capture methods and a conventional 6 degrees of freedom (6DoF) marker model.This dataset accompanies the following paper: Tang, Jing, Mcgrath, Michael, Hale, Nicholas, Jiang, Liudi, Bader, Dan, Moser, David, Laszczak, Piotr, Bradbury, Richard and Zahhedi, Saeed (2016) Assessing trans-femoral residuum/socket interface coupling using 3D motion capture – effect of terrains and walking speeds. Gait & Posture