Teaching toileting skills are among the most essential educational objectives for children with autism; however, there are few investigations of the utility of various toilet training approaches for this population of children. The intensive toilet training program presented in this report used the scientifically supported principles of applied behavior analysis (ABA) to teach two 5- and 3-year old boys with autism to stay accident free between scheduled toilet visits. The program consisted of pre-training, intensive training, and post-training activities. The children attained day-time toileting skills rapidly and consistently throughout the program. The procedures followed during these activities and the outcomes regarding each participant are presented in the report.