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In this descriptive epidemiological study, age-specific rates for attention-deficit and hyperactivity disorder (ADHD) incidence among children (0–14 years) were presented (per 100,000). Joinpoint regression analysis was applied to calculate the average annual percent change (AAPC) with the corresponding 95% confidence interval (CI) to evaluate trends in 1990–2019. Global ADHD incidence was nearly threefold that of girls (307.9 and 114.4 per 100,000, respectively) in 2019. Trends for global ADHD incidence were significantly decreasing both in boys (AAPC = −0.4%, 95% CI = −0.4 to −0.3) and girls (AAPC = −0.4%, 95% CI = −0.5 to −0.3).