Background: Tralokinumab, a fully human IgG4 monoclonal antibody that specifically binds with high affinity to interleukin-13, effectively reduces moderate-to-severe atopic dermatitis (AD) when given every 2 weeks. The incidence of conjunctivitis is elevated vs. placebo, but severity and aetiology have not been examined. Objective: To analyse conjunctivitis data recorded in five randomized, placebo-controlled trials of tralokinumab in adult patients with moderate-to-severe AD. Methods: Overall, 2285 adults with AD were studied up to 16 weeks. Cochran–Mantel–Haenszel weights were applied to calculate the adjusted incidence of adverse events. Results: The incidence of conjunctivitis was higher (7·5%) with tralokinumab than with placebo (3·2%). Most events were mild or moderate in severity, and 78·6% and 73·9% of events resolved during the trial in the tralokinumab and placebo groups, respectively. Two (1·4%) events led to the permanent discontinuation of tralokinumab. An increased incidence of conjunctivitis, regardless of treatment group, was associated with more severe baseline AD, and history of allergic conjunctivitis/atopic keratoconjunctivitis, as well as the number of atopic comorbidities. Limitations: This analysis reports events up to week 16 only, with limited confirmation of conjunctivitis and its aetiology by an ophthalmologist, and insufficient reporting of ophthalmic treatments. Conclusions: Treatment with tralokinumab was associated with an increased incidence of conjunctivitis vs. placebo, but these cases were mostly mild and transient.