Disclosure of LGBTQ+ identities at work may reap benefits, but may also exacerbate harms. Faced with ambiguous outcomes, people engage in complex concealment/disclosure decision-making. For health professionals, in contexts of pervasive heteronormativity where disclosure to patients/clients is deemed to violate professional boundaries, stakes are high. This qualitative study with 13 LGBTQ+ health professionals across Canada used semi-structured interviews to explore factors affecting disclosure decision-making, particularly attending to power structures at multiple levels. Most participants engaged in constant risk-benefit assessment, disclosing strategically to colleagues, rarely to clients/patients. At the individual level they were affected by degree of LGBTQ+ visibility. At the institutional level they were affected by the culture of particular professional fields and practice settings, including type of care and type of patients/clients, as well as colleague interactions. Professional power–held by them, and held by others over them–directly affected disclosures. Finally, intersections of queer identities with other privileged or marginalized identities complicated disclosures. Power relations in the health professions shape LGBTQ+ identity disclosures in complex ways, with unpredictable outcomes. Concepts of professionalism are infused with heteronormativity, serving to regulate the gender and sexual identity expression of queer professionals. Disrupting heteronormativity is essential to forge more open professional cultures.