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Objectives: Tonsillectomy and adenoidectomy are common surgical procedures that cause persistent pain, bleeding, and functional limitations. We aimed to investigate the efficacy of celecoxib compared with a placebo for managing post‐tonsillectomy or adenoidectomy pain and other adverse events. Design: Systematic review and meta‐analysis. Methods: We conducted a systematic literature search in the PubMed, Cochrane, and Google Scholar databases from inception until July 2023. Dichotomous outcomes have been reported as risk ratios (RR) while continuous outcomes were reported using mean differences (MD). A funnel plot was drawn to investigate publication bias. Results: From 1394 records identified, 6 randomised double‐blind trials comprising 591 participants undergoing tonsillectomy and/or adenoidectomy were eligible for inclusion. A high dose (400 mg) of celecoxib was effective in decreasing the pain score for 'worst pain' after the procedure (MD: −10.98, [95% CI: −11.53, −10.42], p <.01, I2 = 0%) while a low dose (200 mg) was not significantly effective (p = 0.31). For managing other outcomes such as vomiting (RR: 1.37 [95% CI: 0.69, 2.68], p = 0.37, I2 = 67%), diarrhoea (RR: 1.41, [95% CI: 0.75, 2.64], p =.29, I2 = 42%), dizziness/drowsiness (RR: 0.90, [95% CI: 0.71, 1.15], p =.48, I2 = 0%), functional recovery time (p =.74), and headache (p =.91), there was no significant difference between the group on celecoxib and the placebo group regardless of dosage. Finally, there was no significant difference (RR: 1.02, [95% CI: 0.91, 1.15], p =.69, I2 = 0%) in the effect of the intervention on minimum bleeding, moderate bleeding, and profuse bleeding. Conclusion: This meta‐analysis provides robust evidence pooled from high‐quality trials and raises questions about the efficacy of celecoxib for tonsillectomy and/or adenoidectomy, challenging existing perceptions. [ABSTRACT FROM AUTHOR]