Data used in article "In Situ XAFS of Acid-Resilient Iridate Pyrochlore Oxygen Evolution Electrocatalysts Under Operating Conditions" Figure 1a: 1 file of powder XRD data in 2-column acsii format. Angle, intensity Figure 2a: 4 individual files of normalised X-ray absorption spectra. 2-column ascii. Energy, absorption. Figures 3 and 4: raw EXAFS data files. The supporting pdf file "Summary of raw XAFS data.pdf" describes the data format and tabulates the individual data files.