This pilot mixed methods evaluation describes the impact of an antioppression workshop on allyship development among a group of public health graduate students. After completing a mandatory antioppression workshop, a survey including closed- and open-ended questions was administered to 41 public health students specializing in health promotion. Closed-ended questions gathered basic demographic data and Likert-type scale responses to assess changes in participant knowledge, awareness, and attitudes surrounding antioppression concepts discussed during the workshop, while open-ended questions asked respondents to reflect on how such changes might influence their development as allies. A response rate of 65.85% (27 respondents) was achieved. The majority of the study group were between the ages of 20 and 24 years (74.07%), self-identified as straight (77.8%), and self-identified as non-White (77.8%), while almost the entire group identified as female (92.59%). Five key themes emerged from a directed content analysis of qualitative data, identifying the importance of antioppression workshops for allyship development: conducive environments, positionality, knowledge, active listening and learning, and advocacy. These themes were used to construct a mixed methods joint display for comparative interpretation of quantitative and qualitative data. Mixed methods analysis revealed that antioppression workshops can promote allyship development by increasing knowledge of key terms and concepts associated with antioppression and facilitating critical reflections on power, privilege, and social location. Our findings demonstrate a profound need for ongoing antioppression training among future public health students and professionals.