The Internet is having a profound impact on the literacy practices of students worldwide; yet, there are few instruments available to facilitate cross-cultural comparisons and conclusions specific to cognitive and affective variables related to Internet proficiency. This research was conducted to examine the measurement invariance of the Cross-Cultural Survey of Online Reading Attitudes and Behaviors (SORAB-XC) across a sample of participants from South Korea and the United States. Strong structural validity information was noted for SORAB-XC in each sample, and the results revealed measurement invariance of the item loadings of SORAB-XC between the samples, which justifies the comparison across the samples with respect to the relations between latent factor variables. Implications for future research address the use of the instrument in each individual context; however, additional refinements are required to enable cross-cultural mean comparisons.