The aim of this qualitative study was to retrospectively examine nondisclosure in individual supervision while in training. Interviews were conducted with supervisees two years post-qualification. Specific nondisclosures were examined and reasons for these nondisclosures were explored. Six in-depth semi-structured interviews were conducted and data analysis drew on Consensual Qualitative Research. The findings revealed four categories relating to: (i) the nature of the difficulty; (ii) reasons for nondisclosure; (iii) the supervisory relationship; and (iv) facilitative factors. The quality of the supervisory relationship was a significant element in nondisclosure. A key recommendation was that role induction for supervisees should be incorporated into training programmes to assist supervisees in learning how to use supervision more effectively. Limitations of the study and further research are provided in light of current findings.