This study aims to examine the correlations between five types of metacognition and Internet gaming disorder (IGD), which have not been previously reported in the literature. Based on Wells and Matthews’ self-regulatory executive function (S-REF) model, these five metacognition constructs (i.e., positive beliefs about worry, negative beliefs about worry, need for control, lack of cognitive confidence, and cognitive self-consciousness) are salient risk factors for the development and persistence of mental disturbance/disorders including behavioral addictions, but further evidence is warranted. This study recruited 680 young adult participants (Mage = 20) who voluntarily filled out an anonymous questionnaire online. Their metacognitive beliefs were assessed by Zhang et al.’s Chinese version of the short form of Metacognitions Questionnaire while the nine diagnostic criteria proposed in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders were used as a self-reported checklist of IGD symptoms. The present results showed that, consistent with the hypotheses, metacognitive beliefs were positively correlated with IGD symptoms reported. After controlling for age and gender, three types of metacognition, including positive beliefs about worry, emerged as the significant predictors of IGD symptoms in a hierarchical regression model. Our findings corroborated the existing literature that some metacognitive beliefs or practices can be maladaptive and may increase one’s susceptibility to behavioral addictions including IGD. Metacognitive therapy is a potentially effective treatment for these disorders.