This is the first study to examine the relationship between materialism and gambling disorder. Participants included 65 adults seeking treatment for gambling disorder, and 65 adults who did not have gambling problems. Participants with gambling disorder had lower self-esteem. They were also more likely to be materialistic. Specifically, they were more likely to believe that material goods could lead to happiness and reflect success in life. Participants who believed that material goods could lead to happiness were more likely to gamble for financial gain. Thus, they might gamble excessively in the hope of winning the money they would need to buy material goods and achieve happiness, leading to gambling disorder.