In the Original Investigation titled “Communication of Intent to Do Harm Preceding Mass Public Shootings in the United States, 1966 to 2019,”[1] published November 4, 2021, there were errors in Table 3. The odds ratios that appear in model 3 for psychiatric medication, social media use, planning, performance, interest in past mass violence, and fame-seeking motive should have read NA, 1.7 (0.4-7.6), 3.1 (0.9-11.0), 1.3 (0.2-8.3), 2.0 (0.5-7.6), and 0.3 (0.0-2.4), respectively. The P values should have read NA, .46, .08, .77, .29. and .25, respectively. This article has been corrected.[1]