The current study examined treatment intrusiveness within behavior intervention programs developed for adults with intellectual disability (ID). Behavior analysts provided demographic information about themselves, their adult clients with ID, and their clients’ behavior intervention plans, and they completed an online version of the Treatment Intrusiveness Measure (Carter et al., 2009), an instrument that provides a Base Level Intrusiveness Score (BLIS; a score computed across five areas of categorization, such as, Health and Safety) and a Modified Level of Intrusiveness Score (MLIS), which assesses the presence or absence of intrusiveness-reducing practices. Among other findings, various statistical analyses revealed (a) a significant difference between BLIS and modified (BLIS minus MLIS) intrusiveness scores, (b) the practices within which most of the intrusiveness was concentrated within behavioral treatment programs, and (c) the least- and most-utilized intrusiveness-reducing practices. Implications are provided to assist professionals working with adults with ID who engage in challenging behavior and are supported through behavior intervention services.