We investigate discrimination experiences of (1) immigrants and racialized individuals, (2) Indigenous peoples, and (3) comparison White non-immigrants in nine regions of Southwestern Ontario containing small- and mid-sized communities. For each region, representative samples of the three groups were recruited to complete online surveys. In most regions, over 80 percent of Indigenous peoples reported experiencing discrimination in the past 3 years, and in more than half of the regions, over 60 percent of immigrants and racialized individuals did so. Indigenous peoples, immigrants and racialized individuals were most likely to experience discrimination in employment settings and in a variety of public settings, and were most likely to attribute this discrimination to racial and ethnocultural factors, and for Indigenous peoples also their Indigenous identity. Immigrants and racialized individuals who had experienced discrimination generally reported a lower sense of belonging and welcome in their communities. This association was weaker for Indigenous peoples. The findings provide new insight into discrimination experienced by Indigenous peoples, immigrants and racialized individuals in small and mid-sized Canadian communities, and are critical to creating and implementing effective anti-racism and anti-discrimination strategies.