Journal of Mixed Methods Research (JMMR) has published several special issues on triangulation (Mertens & Hesse-Biber, 2012), marginalized populations (Sorde-Marti & Mertens, 2014), migration (Bergman, 2018), and the COVID-19 pandemic (Fetters & Molina-Azorin, 2021b). The JMMR encourages future special issues that focus on relevant theoretical and methodological topics and advancements in the field of mixed methods research, adding value and contributing to the mixed methods literature (Molina-Azorin & Fetters, 2018). In addition, JMMR has also published virtual special issues as online-only collections of previously published JMMR articles with contributions relative to a chosen theme (Fetters & Molina-Azorin, 2020): paradigms (Molina-Azorin & Fetters, 2020), integration (Guetterman et al., 2020), quality (Fàbregues et al., 2021, mixed methods research in education (Shannon-Baker, 2022), designs , and collaborative practices in mixed methods research (Archibald, 2023).Perhaps a marker of the development of mixed methods from an emerging to an established field is the publication of special issues in broader methodological journals and discipline-specific journals. A profession is defined by features such as a technical basis, a clear scope, training standards, and recognition that its services are "uniquely trustworthy" (Wilensky, 1964, p. 138). Special issues about mixed methods provide evidence that this field is recognized by other fields (i.e., our public as scholars) as unique and valid.In this editorial, we examine special issues on mixed methods research published in other journals. Special issues include a collection of manuscripts, and they usually are based on previous call for papers. Special issues usually are led and managed by one or more guest editors. As noted above, the publication in other journals of special issues focused on mixed methods may be considered as an indicator of how the mixed methods field is growing and maturing. Two previous editorials in JMMR examined two indicators of this maturity: the extent that international organizations embrace and provide guidance for conducting mixed methods studies (Fetters & Molina-Azorin, 2021a) and the books published about mixed methods research (Molina-Azorin & Fetters, 2022). In our view, the publication of special issues on mixed methods in a variety of journals also signifies the development, recognition, and professionalization of the mixed methods field.