Background: One of the most important aspects of receiving medical care is access to that care. For people with mental illness who have greater healthcare needs and are at risk for poor health outcomes, reduced access to care constitutes a crisis. While the COVID-19 (coronavirus disease 2019) pandemic continues to affect the United States, specifying what it means to have access to mental healthcare is more critical than ever. Objective: The aim of this concept analysis is to review definitions and descriptions of access to mental healthcare in the literature and to synthesize the relevance of these findings to inform future research, theory development, policy, and practice. Study Design: The concept of access to mental healthcare was analyzed using Rodgers’s evolutionary concept analysis method. CINAHL, PsycINFO, and MEDLINE were queried for peer-reviewed articles about access to mental healthcare published from January 2010 to April 2020 ( n = 72). Data were reviewed for concept antecedents, attributes, consequences, surrogate, and related terms. Results: Five models of access to mental healthcare were identified, with several antecedents and consequences: utilization, economic loss/gain, incarceration, and patient/provider satisfaction. Cross-sectional and predictive studies highlighted three interrelated attributes: clinical management, healthcare delivery, and connectedness. Conclusions: The concept of access to mental healthcare is often used stagnantly across disciplines to create health policies, yet the concept is transformative. Future research requires up-to-date operational definitions of access to mental healthcare to target interdisciplinary approaches.