The purpose of the present study was to investigate whether a specific testing accommodation (extended time) affects test scores for college students with and without ADHD. College students with ADHD (N = 61) and without ADHD (N = 68) took a math test, after having been told they had either standard time or extended time to complete the test. Results indicated that the testing condition (i.e., extended versus standard time) had no significant effect on test scores or on the amount of time students took to complete the test. However, students with ADHD, on average, took more time to complete the test, attained lower test scores, and had lower state self-esteem than students without ADHD.