With the largest online gamer population worldwide and a heightened rate of Internet Gaming Disorder (IGD), China has a long-lasting need to identify salient correlates of IGD and provide corresponding assessment tools to support cost-effective IGD screening and interventions. To respond to such a need, the present study aimed to validate the Metacognitions about Online Gaming Scale (MOGS) among Chinese gamers to provide an additional tool for promoting studies investigating metacognition, a promising and newly emerged correlate of IGD, in China. To evaluate the psychometric properties of MOGS, we collected data from 1340 Chinese university students with gaming experiences (59.3% female, M = 19.84 years), in which 262 of them also participated in the one-month retest. Our results indicated that the Chinese version of MOGS has a two-factor structure and satisfactory reliabilities (α = 0.90 and 0.92, ICC = 0.60 and 0.64, AVE = 0.56 and 0.70, ρ = 0.88 and 0.92). Moreover, MOGS's convergent validity was evidenced by the expected, positive associations with generic metacognitions, stress, and IGD tendency (r (1338) = 0.29-0.55, p < 0.001) as well as significant MOGS differences between probable IGD and non-IGD gamers (p < 0.001). A 6-item, short-form MOGS, which displayed equivalent psychometric soundness as its full-scale counterpart, was also developed. As the first study to validate MOGS among Chinese gamers, the present study attested to the readiness of this measure in facilitating further studies of gaming-specific metacognitions for early identification of and tailored interventions for high-risk gamers in China.