Background: Use of technological resources that provide support for mental health (ie, digital mental health tools) and opportunities to use the internet to communicate with others or receive information about mental health (ie, online mental health communication) are growing in popularity among young adults (ages 18-29). However, whether exposure to the negative experience of racism online is associated with use of digital mental health tools and online mental health communication remains an important empirical question for Black young adults, given their frequent online use and engagement. Objective: This study sought to examine (1) how the frequency of exposure to online racism is associated with use of digital mental health tools and engagement in online mental health communication, and (2) how these associations differ for Black young adults with either anxiety and depression versus those without. Methods: Conducted from July to September 2024, data came from a larger cross-sectional study of 1005 monoracial Black young adults (N = 1005; Mage = 24.07, SDage = 3.04, 50.6% women) who completed an online survey and self-reported measures of exposure to online racism, use of digital mental health tools, frequency of engaging in online mental health communication, and anxiety and depressive symptoms. Two separate path analysis regression models were conducted for the outcomes of depression and anxiety. Results: Our results showed that more frequent exposure to online racism was associated with a greater likelihood of using digital mental health tools (ORs range 1.72-1.84, p