Individuals with intellectual disabilities (ID) are more vulnerable to mental health difficulties than the general population, yet there are limited evidence‐based treatments available for this group. There has been a growing interest in adapting cognitive behaviour therapy (CBT) for this population; however, a framework describing how to modify cognitive challenging for a group characterized by cognitive impairment is lacking. The aim of this paper is threefold: (a) to describe how to implement cognitive challenging for adults with ID; (b) to report results from a pilot evaluation of a manualized, modified CBT‐ID programme for anxiety; and (c) to compare participants with mild versus moderate ID on post‐treatment cognitive challenging competencies.. To read the full article, log in using your SSSFT NHS OpenAthens details. SSOTP - You can request a copy of this article by replying to this email. Please ensure you are clear which article you are requesting.