Using data from computer-assisted telephone interviews with 1000 18- to 24-year old Australians, the structure underlying participation in 12 gambling activities was investigated. Factor analysis indicated that activities were differentiated into those that are chance-based, involve selecting a winner and involve individuals' skills. Gambling problems, assessed using a four-item factor, were related to participation in the two skill-based activity types. Males participated in these more than females. Age was positively related to participating in activities involving selecting a winner and negatively to those involving individuals' skills. Participation in activities associated with the three factors was differentially related to individual difference factors along with family and peer participation in, and support for, gambling. Together the results indicate that young Australians do not view gambling activities homogeneously and future research should focus on the predictors and outcomes of different types of gambling among this age group.