The Test of Nonverbal Intelligence-3rd Edition (TONI-3) and the Analogic Reasoning (AR) subscale of the Universal Nonverbal Intelligence Test (UNIT) were administered to 35 individuals with autism to determine whether real-world-knowledge deficits affected intelligence scores. The 2 tests are similar in format; however, the TONI-3 includes only abstract reasoning items, while the AR subscale includes both abstract reasoning and real-world-knowledge items. The results indicated that although there were no significant differences in overall scores across the 2 measures, the number of items pertaining to real-world-knowledge completed on the AR subscale did differentiate test scores. Participants completing a greater percentage of real-world-knowledge items on the AR subscale scored more than 8 points better on the TONI-3; no differences were found between the two tests for those completing fewer real-world-knowledge items. When age was controlled for, it was found that participants completing a greater percentage of real-world-knowledge items on the AR subscale scored more than 13 points higher on the TONI-3. The implications of these results for the assessment of individuals with autism are discussed.