BACKGROUND AND AIMS: Patients with inflammatory bowel disease [IBD] have a more than two fold higher risk of venous thromboembolic events [VTE] than the general population. The aetiology is complex, and the role of medication is not precisely defined. We aimed to assess the effects of anti-tumor necrosis factor alpha [anti-TNFalpha] drugs and conventional anti-inflammatory therapy, namely corticosteroids [CS], immunomodulators [IM], and 5-aminosalicylates [5-ASA] on VTE in IBD. METHODS: A systematic search was performed in five databases on November 22, 2022. We included studies reporting VTE in the distinct categories of medications, determined the proportions, and calculated the odds ratios [OR] with 95% confidence intervals [CI], using the random-effects model. The risk of bias was evaluated with the Joanna Briggs Institute Critical Appraisal Checklist and the Risk of Bias in Non-randomized Studies of Interventions tool. RESULTS: The quantitative analysis included 16 observational studies, with data from 91 322 IBD patients. Patients receiving anti-TNFalpha medication had significantly less VTE [proportion: 0.05, CI: 0.02-0.10], than patients treated with CS [proportion: 0.16, CI: 0.07-0.32], with OR = 0.42 [CI: 0.25-0.71]. IMs resulted in similar proportions of VTE compared with biologics [0.05, CI: 0.03-0.10], with OR = 0.94 [CI: 0.67-1.33]. The proportion of patients receiving 5-ASA having VTE was 0.09 [CI: 0.04-0.20], with OR = 1.00 [CI: 0.61-1.62]. CONCLUSIONS: Biologics should be preferred over corticosteroids in cases of severe flare-ups and multiple VTE risk factors, as they are associated with reduced odds of these complications. Further studies are needed to validate our data.