Inclusion, diversity, belonging, and equity (IDBE) are tenets discussed and developed in many universities and university libraries. Although there were studies on IDBE in libraries in general, the authors of this study were particularly interested in what Science, Technology, Engineering, Mathematics and Medicine (STEMM) librarians were facing or not facing regarding IDBE. We were unable to locate any known study focusing on STEMM librarians' lived experiences regarding IDBE. Thus, our study aimed to explore this area further. A survey consisting of multiple-choice, Likert and short-answer questions was sent to STEMM librarians via specific listservs. In this study, we use a grounded theory approach and analyze three of the questions in the survey. This study would particularly interest librarians who would like to ascertain the climate of IDBE and the intersection with social justice in STEMM Librarianship. Also, we provide strategies to improve the climate and provide a more inclusive, diverse, equitable and belonging environment for STEMM Librarians. Our data analysis shows that STEMM librarians who identify as People of Color encounter negative behaviors, experiences, and attitudes at a much higher rate than STEMM librarians who are white. In addition, many STEMM librarians who identify as white report white privilege awareness.