Little is known about athletes' perceptions of emerging dietary guidance on plant-based diets (PBD). To explore knowledge and perceptions of PBD among competitive and recreational athletes, an online survey was developed, pilot tested, and sent via email to athletes recruited from 2 Canadian post-secondary institutions. Survey questions explored athletes' understanding and views of the proposed Canadian dietary guidelines emphasizing plant-based proteins. Data were analyzed using grounded theory approaches. Forty-eight athletes participated in the survey. Two major themes emerged: (i) athletes had mixed perceptions of plant-based eating (PBE) and (ii) athletes associated PBE with broader food system concerns. Athletes have the potential to be important advocates of healthy and sustainable eating among peer groups and the general public. For effective promotion of PBE, the unique nutrient requirements and performance goals of athletes should be considered. Messaging to encourage a flexible rather than strict view of PBD may be a more feasible and acceptable approach when working with athletes.