The data on the following sheets is associated with the paper: Evans, M.G., Alderson, D.M., Evans, C.D., Stimson, A., Goulsbra, C., Allott,T.E.H., Worrall, F., Crouch, T., Walker, J., Garnett, M.H., Rowson, J. (2022). Carbon Loss Pathways in Degraded Peatlands: New Insights from Radiocarbon Measurements of Peatland Waters. The data are organised according to the figures within the paper, with the data for each figure corresponding to an individual datasheet. The methods for data collection can be found in the associated manuscript. For further information please contact Martin Evans (martin.g.evans@manchester.ac.uk) or Danielle Alderson (danielle.alderson@manchester.ac.uk). Figures 1, 7 and 11 either do not contain data or are visual model outputs and are therefore not included.