In academia, as in any profession, one of the toughest decisions facing an autistic person is whether and when to disclose their diagnosis. On the one hand, disclosure can bring awareness, understanding, and support. On the other, it can bring misunderstanding, stigma, and discrimination. In this chapter participants reflect on their decisions to disclose (or not to disclose) to employers, colleagues, staff, and students – and the impacts of these decisions. This chapter also addresses the issue of masking (hiding their autistic characteristics), including when and why participants feel the need to mask and the impact this has on them.