Introduction Women, Infants and Children (WIC) nutrition professionals serve as frontline providers for Black families who disproportionately experience poor perinatal outcomes. With racism driving inequities, we developed an antiracism training tailored to WIC. This report describes the training framework, design, components, and evaluation. Methods In 2019, with feedback from WIC providers, we created a 3-h antiracism training for Philadelphia WIC nutrition professionals that included an identity reflection, key concept definitions, workplace scenario and debrief, a model for repair and disruption, and an action tool. We implemented this training in August 2019 and surveyed WIC staff trainees’ awareness of racism and skills to address bias before, immediately after, and 6 months post-training, comparing responses at each time point. Results Among 42 WIC staff trainees, mean age was 30 years, 56% were white, 91% female, and 74% had no prior antiracism training. Before the training, 48% felt quite a bit or extremely aware of the role of racism in the healthcare system; this increased to 91% immediately after and was 75% 6 months later. Similar increases in confidence identifying and addressing interactions that perpetuate racism were achieved immediately after training, although the magnitude decreased by 6 months. One-third felt quite a bit or extremely confident the training improved participant interactions at the 6-month timepoint. Qualitative feedback reinforced findings. Discussion Results suggest antiracism training may improve WIC nutrition professionals’ attitudes, awareness, and actions and could be valuable in efforts to advance health equity. More work is needed to examine how changes translate into improvements for WIC participants.