ObjectiveTo evaluate the educational impact of RheumMadness, an online tournament of rheumatology concepts grounded in social constructivist theory, as viewed through the community of inquiry (CoI) framework.MethodsThe curricular scaffold of RheumMadness was a bracket of 16 rheumatology concepts competing as “teams” in a tournament. Participants could create and review “scouting reports” about each team, listen to a RheumMadness podcast, discuss on social media, and submit a bracket predicting tournament outcomes according to the perceived importance of each team. Engagement was measured with direct analytics and through self‐report on a survey. The survey also assessed participants’ educational experience using an adapted 34‐item CoI survey, which describes the cognitive, social, and teaching presences in a learning activity.ResultsOne hundred brackets were submitted. On average, each scouting report was viewed 92 times, each podcast episode was downloaded 163 times, and 486 tweets were sent about #RheumMadness from 105 users. The survey received 58 of 107 responses (54%). Respondent agreement with prompts related to each CoI presence was: 70.3% cognitive, 61.7% social, 84.9% teaching. Reported engagement in RheumMadness correlated strongly with overall CoI survey scores (r = 0.72, P < 0.001).ConclusionRheumMadness created an online CoI that fostered social constructivist learning about rheumatology.